diff --git a/neutron_test.sh b/neutron_test.sh
index ee0af2abc..d6dc75409 100755
--- a/neutron_test.sh
+++ b/neutron_test.sh
@@ -28,12 +28,10 @@ fi
 echo "NOTE: User should be admin in order to perform all operations."
 sleep 3
 
-FORMAT=" --request-format json"
-
 # test the CRUD of network
 network=$net_name
-neutron net-create $FORMAT $NOAUTH $network || die "fail to create network $network"
-temp=`neutron net-list $FORMAT -- --name $network --fields id | wc -l`
+neutron net-create $NOAUTH $network || die "fail to create network $network"
+temp=`neutron net-list -- --name $network --fields id | wc -l`
 echo $temp
 if [ $temp -ne 5 ]; then
    die "networks with name $network is not unique or found"
@@ -41,66 +39,66 @@ fi
 network_id=`neutron net-list -- --name $network --fields id | tail -n 2 | head -n 1 |  cut -d' ' -f 2`
 echo "ID of network with name $network is $network_id"
 
-neutron net-show $FORMAT $network ||  die "fail to show network $network"
-neutron net-show $FORMAT $network_id ||  die "fail to show network $network_id"
+neutron net-show $network ||  die "fail to show network $network"
+neutron net-show $network_id ||  die "fail to show network $network_id"
 
-neutron  net-update $FORMAT $network --admin_state_up False  ||  die "fail to update network $network"
-neutron  net-update $FORMAT $network_id --admin_state_up True  ||  die "fail to update network $network_id"
+neutron  net-update $network --admin_state_up False  ||  die "fail to update network $network"
+neutron  net-update $network_id --admin_state_up True  ||  die "fail to update network $network_id"
 
-neutron net-list $FORMAT -c id -- --id fakeid  || die "fail to list networks with column selection on empty list"
+neutron net-list -c id -- --id fakeid  || die "fail to list networks with column selection on empty list"
 
 # test the CRUD of subnet
 subnet=$subnet_name
 cidr=10.0.1.0/24
-neutron subnet-create $FORMAT $NOAUTH $network $cidr --name $subnet  || die "fail to create subnet $subnet"
-tempsubnet=`neutron subnet-list $FORMAT -- --name $subnet --fields id | wc -l`
+neutron subnet-create $NOAUTH $network $cidr --name $subnet  || die "fail to create subnet $subnet"
+tempsubnet=`neutron subnet-list -- --name $subnet --fields id | wc -l`
 echo $tempsubnet
 if [ $tempsubnet -ne 5 ]; then
    die "subnets with name $subnet is not unique or found"
 fi
-subnet_id=`neutron subnet-list $FORMAT -- --name $subnet --fields id | tail -n 2 | head -n 1 |  cut -d' ' -f 2`
+subnet_id=`neutron subnet-list -- --name $subnet --fields id | tail -n 2 | head -n 1 |  cut -d' ' -f 2`
 echo "ID of subnet with name $subnet is $subnet_id"
-neutron subnet-show $FORMAT $subnet ||  die "fail to show subnet $subnet"
-neutron subnet-show $FORMAT $subnet_id ||  die "fail to show subnet $subnet_id"
+neutron subnet-show $subnet ||  die "fail to show subnet $subnet"
+neutron subnet-show $subnet_id ||  die "fail to show subnet $subnet_id"
 
-neutron  subnet-update $FORMAT $subnet --dns_nameservers list=true 1.1.1.11 1.1.1.12  ||  die "fail to update subnet $subnet"
-neutron  subnet-update $FORMAT $subnet_id --dns_nameservers list=true 2.2.2.21 2.2.2.22  ||  die "fail to update subnet $subnet_id"
+neutron  subnet-update $subnet --dns_nameservers list=true 1.1.1.11 1.1.1.12  ||  die "fail to update subnet $subnet"
+neutron  subnet-update $subnet_id --dns_nameservers list=true 2.2.2.21 2.2.2.22  ||  die "fail to update subnet $subnet_id"
 
 # test the crud of ports
 port=$port_name
-neutron port-create $FORMAT $NOAUTH $network --name $port  || die "fail to create port $port"
-tempport=`neutron port-list $FORMAT -- --name $port --fields id | wc -l`
+neutron port-create $NOAUTH $network --name $port  || die "fail to create port $port"
+tempport=`neutron port-list -- --name $port --fields id | wc -l`
 echo $tempport
 if [ $tempport -ne 5 ]; then
    die "ports with name $port is not unique or found"
 fi
-port_id=`neutron port-list $FORMAT -- --name $port --fields id | tail -n 2 | head -n 1 |  cut -d' ' -f 2`
+port_id=`neutron port-list -- --name $port --fields id | tail -n 2 | head -n 1 |  cut -d' ' -f 2`
 echo "ID of port with name $port is $port_id"
-neutron port-show $FORMAT $port ||  die "fail to show port $port"
-neutron port-show $FORMAT $port_id ||  die "fail to show port $port_id"
-neutron  port-update $FORMAT $port --device_id deviceid1  ||  die "fail to update port $port"
-neutron  port-update $FORMAT $port_id --device_id deviceid2  ||  die "fail to update port $port_id"
-neutron  port-update $FORMAT $port_id --allowed-address-pair ip_address=1.1.1.11,mac_address=10:00:00:00:00:00 --allowed-address-pair ip_address=1.1.1.12,mac_address=10:00:00:00:00:01 ||  die "fail to update port $port_id --allowed-address-pair"
-neutron port-show $FORMAT $port ||  die "fail to show port $port"
-neutron port-show $FORMAT $port_id ||  die "fail to show port $port_id"
-neutron  port-update $FORMAT $port_id --no-allowed-address-pairs ||  die "fail to update port $port_id --no-allowed-address-pairs"
-neutron port-show $FORMAT $port ||  die "fail to show port $port"
-neutron port-show $FORMAT $port_id ||  die "fail to show port $port_id"
+neutron port-show $port ||  die "fail to show port $port"
+neutron port-show $port_id ||  die "fail to show port $port_id"
+neutron  port-update $port --device_id deviceid1  ||  die "fail to update port $port"
+neutron  port-update $port_id --device_id deviceid2  ||  die "fail to update port $port_id"
+neutron  port-update $port_id --allowed-address-pair ip_address=1.1.1.11,mac_address=10:00:00:00:00:00 --allowed-address-pair ip_address=1.1.1.12,mac_address=10:00:00:00:00:01 ||  die "fail to update port $port_id --allowed-address-pair"
+neutron port-show $port ||  die "fail to show port $port"
+neutron port-show $port_id ||  die "fail to show port $port_id"
+neutron  port-update $port_id --no-allowed-address-pairs ||  die "fail to update port $port_id --no-allowed-address-pairs"
+neutron port-show $port ||  die "fail to show port $port"
+neutron port-show $port_id ||  die "fail to show port $port_id"
 neutron port-delete $port_id
 
 # test the create port with allowed-address-pairs
 port=$port_name
-neutron port-create $FORMAT $NOAUTH $network --name $port -- --allowed-address-pairs type=dict list=true ip_address=1.1.1.11,mac_address=10:00:00:00:00:00 ip_address=1.1.1.12,mac_address=10:00:00:00:00:01 || die "fail to create port $port"
-tempport=`neutron port-list $FORMAT -- --name $port --fields id | wc -l`
+neutron port-create $NOAUTH $network --name $port -- --allowed-address-pairs type=dict list=true ip_address=1.1.1.11,mac_address=10:00:00:00:00:00 ip_address=1.1.1.12,mac_address=10:00:00:00:00:01 || die "fail to create port $port"
+tempport=`neutron port-list -- --name $port --fields id | wc -l`
 echo $tempport
 if [ $tempport -ne 5 ]; then
    die "ports with name $port is not unique or found"
 fi
-port_id=`neutron port-list $FORMAT -- --name $port --fields id | tail -n 2 | head -n 1 |  cut -d' ' -f 2`
+port_id=`neutron port-list -- --name $port --fields id | tail -n 2 | head -n 1 |  cut -d' ' -f 2`
 echo "ID of port with name $port is $port_id"
-neutron port-show $FORMAT $port ||  die "fail to show port $port"
-neutron port-show $FORMAT $port_id ||  die "fail to show port $port_id"
-neutron  port-update $FORMAT $port_id --no-allowed-address-pairs ||  die "fail to update port $port_id --no-allowed-address-pairs"
+neutron port-show $port ||  die "fail to show port $port"
+neutron port-show $port_id ||  die "fail to show port $port_id"
+neutron  port-update $port_id --no-allowed-address-pairs ||  die "fail to update port $port_id --no-allowed-address-pairs"
 neutron  port-show $port_id
 
 # test quota commands RUD
@@ -108,58 +106,58 @@ DEFAULT_NETWORKS=10
 DEFAULT_PORTS=50
 tenant_id=tenant_a
 tenant_id_b=tenant_b
-neutron quota-update $FORMAT --tenant_id $tenant_id --network 30 || die "fail to update quota for tenant $tenant_id"
-neutron quota-update $FORMAT --tenant_id $tenant_id_b --network 20 || die "fail to update quota for tenant $tenant_id"
-networks=`neutron quota-list $FORMAT -c network -c tenant_id | grep $tenant_id | awk '{print $2}'`
+neutron quota-update --tenant_id $tenant_id --network 30 || die "fail to update quota for tenant $tenant_id"
+neutron quota-update --tenant_id $tenant_id_b --network 20 || die "fail to update quota for tenant $tenant_id"
+networks=`neutron quota-list -c network -c tenant_id | grep $tenant_id | awk '{print $2}'`
 if [ $networks -ne 30 ]; then
    die "networks quota should be 30"
 fi
-networks=`neutron quota-list $FORMAT -c network -c tenant_id | grep $tenant_id_b | awk '{print $2}'`
+networks=`neutron quota-list -c network -c tenant_id | grep $tenant_id_b | awk '{print $2}'`
 if [ $networks -ne 20 ]; then
    die "networks quota should be 20"
 fi
-networks=`neutron quota-show $FORMAT --tenant_id $tenant_id | grep network | awk -F'|'  '{print $3}'`
+networks=`neutron quota-show --tenant_id $tenant_id | grep network | awk -F'|'  '{print $3}'`
 if [ $networks -ne 30 ]; then
    die "networks quota should be 30"
 fi
-neutron quota-delete $FORMAT --tenant_id $tenant_id || die "fail to delete quota for tenant $tenant_id"
-networks=`neutron quota-show $FORMAT --tenant_id $tenant_id | grep network | awk -F'|'  '{print $3}'`
+neutron quota-delete --tenant_id $tenant_id || die "fail to delete quota for tenant $tenant_id"
+networks=`neutron quota-show --tenant_id $tenant_id | grep network | awk -F'|'  '{print $3}'`
 if [ $networks -ne $DEFAULT_NETWORKS ]; then
    die "networks quota should be $DEFAULT_NETWORKS"
 fi
 # update self
 if [ "t$NOAUTH" = "t" ]; then
     # with auth
-    neutron quota-update $FORMAT --port 99 || die "fail to update quota for self"
-    ports=`neutron quota-show $FORMAT | grep port | awk -F'|'  '{print $3}'`
+    neutron quota-update --port 99 || die "fail to update quota for self"
+    ports=`neutron quota-show | grep port | awk -F'|'  '{print $3}'`
     if [ $ports -ne 99 ]; then
        die "ports quota should be 99"
     fi
 
-    ports=`neutron quota-list $FORMAT -c port | grep 99 | awk '{print $2}'`
+    ports=`neutron quota-list -c port | grep 99 | awk '{print $2}'`
     if [ $ports -ne 99 ]; then
        die "ports quota should be 99"
     fi
-    neutron quota-delete $FORMAT || die "fail to delete quota for tenant self"
-    ports=`neutron quota-show $FORMAT | grep port | awk -F'|'  '{print $3}'`
+    neutron quota-delete || die "fail to delete quota for tenant self"
+    ports=`neutron quota-show | grep port | awk -F'|'  '{print $3}'`
     if [ $ports -ne $DEFAULT_PORTS ]; then
        die "ports quota should be $DEFAULT_PORTS"
     fi
 else
     # without auth
-    neutron quota-update $FORMAT --port 100
+    neutron quota-update --port 100
     if [ $? -eq 0 ]; then
         die "without valid context on server, quota update command should fail."
     fi
-    neutron quota-show $FORMAT
+    neutron quota-show
     if [ $? -eq 0 ]; then
         die "without valid context on server, quota show command should fail."
     fi
-    neutron quota-delete $FORMAT
+    neutron quota-delete
     if [ $? -eq 0 ]; then
         die "without valid context on server, quota delete command should fail."
     fi
-    neutron quota-list $FORMAT || die "fail to update quota for self"
+    neutron quota-list || die "fail to update quota for self"
 fi
 
 cleanup
diff --git a/neutronclient/common/constants.py b/neutronclient/common/constants.py
index 525a04058..ccb22cd80 100644
--- a/neutronclient/common/constants.py
+++ b/neutronclient/common/constants.py
@@ -14,18 +14,6 @@
 # limitations under the License.
 
 
-EXT_NS = '_extension_ns'
-XML_NS_V20 = 'http://openstack.org/quantum/api/v2.0'
-XSI_NAMESPACE = "http://www.w3.org/2001/XMLSchema-instance"
-XSI_ATTR = "xsi:nil"
-XSI_NIL_ATTR = "xmlns:xsi"
-TYPE_XMLNS = "xmlns:quantum"
-TYPE_ATTR = "quantum:type"
-VIRTUAL_ROOT_KEY = "_v_root"
-ATOM_NAMESPACE = "http://www.w3.org/2005/Atom"
-ATOM_XMLNS = "xmlns:atom"
-ATOM_LINK_NOTATION = "{%s}link" % ATOM_NAMESPACE
-
 TYPE_BOOL = "bool"
 TYPE_INT = "int"
 TYPE_LONG = "long"
diff --git a/neutronclient/common/serializer.py b/neutronclient/common/serializer.py
index f21e87c7e..e094c2687 100644
--- a/neutronclient/common/serializer.py
+++ b/neutronclient/common/serializer.py
@@ -14,13 +14,10 @@
 #    under the License.
 
 import logging
-from xml.etree import ElementTree as etree
-from xml.parsers import expat
 
 from oslo_serialization import jsonutils
 import six
 
-from neutronclient.common import constants
 from neutronclient.common import exceptions as exception
 from neutronclient.i18n import _
 
@@ -62,148 +59,6 @@ class JSONDictSerializer(DictSerializer):
         return jsonutils.dumps(data, default=sanitizer)
 
 
-class XMLDictSerializer(DictSerializer):
-
-    def __init__(self, metadata=None, xmlns=None):
-        """XMLDictSerializer constructor.
-
-        :param metadata: information needed to deserialize XML into
-                         a dictionary.
-        :param xmlns: XML namespace to include with serialized XML
-        """
-        super(XMLDictSerializer, self).__init__()
-        self.metadata = metadata or {}
-        if not xmlns:
-            xmlns = self.metadata.get('xmlns')
-        if not xmlns:
-            xmlns = constants.XML_NS_V20
-        self.xmlns = xmlns
-
-    def default(self, data):
-        """Default serializer of XMLDictSerializer.
-
-        :param data: expect data to contain a single key as XML root, or
-                     contain another '*_links' key as atom links. Other
-                     case will use 'VIRTUAL_ROOT_KEY' as XML root.
-        """
-        try:
-            links = None
-            has_atom = False
-            if data is None:
-                root_key = constants.VIRTUAL_ROOT_KEY
-                root_value = None
-            else:
-                link_keys = [k for k in six.iterkeys(data) or []
-                             if k.endswith('_links')]
-                if link_keys:
-                    links = data.pop(link_keys[0], None)
-                    has_atom = True
-                root_key = (len(data) == 1 and
-                            list(data.keys())[0] or constants.VIRTUAL_ROOT_KEY)
-                root_value = data.get(root_key, data)
-            doc = etree.Element("_temp_root")
-            used_prefixes = []
-            self._to_xml_node(doc, self.metadata, root_key,
-                              root_value, used_prefixes)
-            if links:
-                self._create_link_nodes(list(doc)[0], links)
-            return self.to_xml_string(list(doc)[0], used_prefixes, has_atom)
-        except AttributeError as e:
-            LOG.exception(str(e))
-            return ''
-
-    def __call__(self, data):
-        # Provides a migration path to a cleaner WSGI layer, this
-        # "default" stuff and extreme extensibility isn't being used
-        # like originally intended
-        return self.default(data)
-
-    def to_xml_string(self, node, used_prefixes, has_atom=False):
-        self._add_xmlns(node, used_prefixes, has_atom)
-        return etree.tostring(node, encoding='UTF-8')
-
-    # NOTE(ameade): the has_atom should be removed after all of the
-    # XML serializers and view builders have been updated to the current
-    # spec that required all responses include the xmlns:atom, the has_atom
-    # flag is to prevent current tests from breaking
-    def _add_xmlns(self, node, used_prefixes, has_atom=False):
-        node.set('xmlns', self.xmlns)
-        node.set(constants.TYPE_XMLNS, self.xmlns)
-        if has_atom:
-            node.set(constants.ATOM_XMLNS, constants.ATOM_NAMESPACE)
-        node.set(constants.XSI_NIL_ATTR, constants.XSI_NAMESPACE)
-        ext_ns = self.metadata.get(constants.EXT_NS, {})
-        for prefix in used_prefixes:
-            if prefix in ext_ns:
-                node.set('xmlns:' + prefix, ext_ns[prefix])
-
-    def _to_xml_node(self, parent, metadata, nodename, data, used_prefixes):
-        """Recursive method to convert data members to XML nodes."""
-        result = etree.SubElement(parent, nodename)
-        if ":" in nodename:
-            used_prefixes.append(nodename.split(":", 1)[0])
-        # TODO(bcwaldon): accomplish this without a type-check
-        if isinstance(data, list):
-            if not data:
-                result.set(
-                    constants.TYPE_ATTR,
-                    constants.TYPE_LIST)
-                return result
-            singular = metadata.get('plurals', {}).get(nodename, None)
-            if singular is None:
-                if nodename.endswith('s'):
-                    singular = nodename[:-1]
-                else:
-                    singular = 'item'
-            for item in data:
-                self._to_xml_node(result, metadata, singular, item,
-                                  used_prefixes)
-        # TODO(bcwaldon): accomplish this without a type-check
-        elif isinstance(data, dict):
-            if not data:
-                result.set(
-                    constants.TYPE_ATTR,
-                    constants.TYPE_DICT)
-                return result
-            attrs = metadata.get('attributes', {}).get(nodename, {})
-            for k, v in sorted(data.items()):
-                if k in attrs:
-                    result.set(k, str(v))
-                else:
-                    self._to_xml_node(result, metadata, k, v,
-                                      used_prefixes)
-        elif data is None:
-            result.set(constants.XSI_ATTR, 'true')
-        else:
-            if isinstance(data, bool):
-                result.set(
-                    constants.TYPE_ATTR,
-                    constants.TYPE_BOOL)
-            elif isinstance(data, int):
-                result.set(
-                    constants.TYPE_ATTR,
-                    constants.TYPE_INT)
-            elif isinstance(data, long):
-                result.set(
-                    constants.TYPE_ATTR,
-                    constants.TYPE_LONG)
-            elif isinstance(data, float):
-                result.set(
-                    constants.TYPE_ATTR,
-                    constants.TYPE_FLOAT)
-            LOG.debug("Data %(data)s type is %(type)s",
-                      {'data': data,
-                       'type': type(data)})
-            result.text = six.text_type(data)
-        return result
-
-    def _create_link_nodes(self, xml_doc, links):
-        for link in links:
-            link_node = etree.SubElement(xml_doc, 'atom:link')
-            link_node.set('rel', link['rel'])
-            link_node.set('href', link['href'])
-
-
 class TextDeserializer(ActionDispatcher):
     """Default request body deserialization."""
 
@@ -227,140 +82,11 @@ class JSONDeserializer(TextDeserializer):
         return {'body': self._from_json(datastring)}
 
 
-class XMLDeserializer(TextDeserializer):
-
-    def __init__(self, metadata=None):
-        """XMLDeserializer constructor.
-
-        :param metadata: information needed to deserialize XML into
-                         a dictionary.
-        """
-        super(XMLDeserializer, self).__init__()
-        self.metadata = metadata or {}
-        xmlns = self.metadata.get('xmlns')
-        if not xmlns:
-            xmlns = constants.XML_NS_V20
-        self.xmlns = xmlns
-
-    def _get_key(self, tag):
-        tags = tag.split("}", 1)
-        if len(tags) == 2:
-            ns = tags[0][1:]
-            bare_tag = tags[1]
-            ext_ns = self.metadata.get(constants.EXT_NS, {})
-            if ns == self.xmlns:
-                return bare_tag
-            for prefix, _ns in ext_ns.items():
-                if ns == _ns:
-                    return prefix + ":" + bare_tag
-        else:
-            return tag
-
-    def _get_links(self, root_tag, node):
-        link_nodes = node.findall(constants.ATOM_LINK_NOTATION)
-        root_tag = self._get_key(node.tag)
-        link_key = "%s_links" % root_tag
-        link_list = []
-        for link in link_nodes:
-            link_list.append({'rel': link.get('rel'),
-                              'href': link.get('href')})
-            # Remove link node in order to avoid link node being
-            # processed as an item in _from_xml_node
-            node.remove(link)
-        return link_list and {link_key: link_list} or {}
-
-    def _from_xml(self, datastring):
-        if datastring is None:
-            return None
-        plurals = set(self.metadata.get('plurals', {}))
-        try:
-            node = etree.fromstring(datastring)
-            root_tag = self._get_key(node.tag)
-            links = self._get_links(root_tag, node)
-            result = self._from_xml_node(node, plurals)
-            # There is no case where root_tag = constants.VIRTUAL_ROOT_KEY
-            # and links is not None because of the way data are serialized
-            if root_tag == constants.VIRTUAL_ROOT_KEY:
-                return result
-            return dict({root_tag: result}, **links)
-        except Exception as e:
-            parseError = False
-            # Python2.7
-            if (hasattr(etree, 'ParseError') and
-                    isinstance(e, getattr(etree, 'ParseError'))):
-                parseError = True
-            # Python2.6
-            elif isinstance(e, expat.ExpatError):
-                parseError = True
-            if parseError:
-                msg = _("Cannot understand XML")
-                raise exception.MalformedResponseBody(reason=msg)
-            else:
-                raise
-
-    def _from_xml_node(self, node, listnames):
-        """Convert a minidom node to a simple Python type.
-
-        :param node: minidom node name
-        :param listnames: list of XML node names whose subnodes should
-                          be considered list items.
-
-        """
-        attrNil = node.get(str(etree.QName(constants.XSI_NAMESPACE, "nil")))
-        attrType = node.get(str(etree.QName(
-            self.metadata.get('xmlns'), "type")))
-        if (attrNil and attrNil.lower() == 'true'):
-            return None
-        elif not len(node) and not node.text:
-            if (attrType and attrType == constants.TYPE_DICT):
-                return {}
-            elif (attrType and attrType == constants.TYPE_LIST):
-                return []
-            else:
-                return ''
-        elif (len(node) == 0 and node.text):
-            converters = {constants.TYPE_BOOL:
-                          lambda x: x.lower() == 'true',
-                          constants.TYPE_INT:
-                          lambda x: int(x),
-                          constants.TYPE_LONG:
-                          lambda x: long(x),
-                          constants.TYPE_FLOAT:
-                          lambda x: float(x)}
-            if attrType and attrType in converters:
-                return converters[attrType](node.text)
-            else:
-                return node.text
-        elif self._get_key(node.tag) in listnames:
-            return [self._from_xml_node(n, listnames) for n in node]
-        else:
-            result = dict()
-            for attr in node.keys():
-                if (attr == 'xmlns' or
-                        attr.startswith('xmlns:') or
-                        attr == constants.XSI_ATTR or
-                        attr == constants.TYPE_ATTR):
-                    continue
-                result[self._get_key(attr)] = node.get(attr)
-            children = list(node)
-            for child in children:
-                result[self._get_key(child.tag)] = self._from_xml_node(
-                    child, listnames)
-            return result
-
-    def default(self, datastring):
-        return {'body': self._from_xml(datastring)}
-
-    def __call__(self, datastring):
-        # Adding a migration path to allow us to remove unncessary classes
-        return self.default(datastring)
-
-
 # NOTE(maru): this class is duplicated from neutron.wsgi
 class Serializer(object):
     """Serializes and deserializes dictionaries to certain MIME types."""
 
-    def __init__(self, metadata=None, default_xmlns=None):
+    def __init__(self, metadata=None):
         """Create a serializer based on the given WSGI environment.
 
         'metadata' is an optional dict mapping MIME types to information
@@ -368,12 +94,10 @@ class Serializer(object):
 
         """
         self.metadata = metadata or {}
-        self.default_xmlns = default_xmlns
 
     def _get_serialize_handler(self, content_type):
         handlers = {
             'application/json': JSONDictSerializer(),
-            'application/xml': XMLDictSerializer(self.metadata),
         }
 
         try:
@@ -381,22 +105,21 @@ class Serializer(object):
         except Exception:
             raise exception.InvalidContentType(content_type=content_type)
 
-    def serialize(self, data, content_type):
+    def serialize(self, data):
         """Serialize a dictionary into the specified content type."""
-        return self._get_serialize_handler(content_type).serialize(data)
+        return self._get_serialize_handler("application/json").serialize(data)
 
-    def deserialize(self, datastring, content_type):
+    def deserialize(self, datastring):
         """Deserialize a string to a dictionary.
 
         The string must be in the format of a supported MIME type.
         """
-        return self.get_deserialize_handler(content_type).deserialize(
+        return self.get_deserialize_handler("application/json").deserialize(
             datastring)
 
     def get_deserialize_handler(self, content_type):
         handlers = {
             'application/json': JSONDeserializer(),
-            'application/xml': XMLDeserializer(self.metadata),
         }
 
         try:
diff --git a/neutronclient/neutron/v2_0/__init__.py b/neutronclient/neutron/v2_0/__init__.py
index 4bd6b1da8..b34be995d 100644
--- a/neutronclient/neutron/v2_0/__init__.py
+++ b/neutronclient/neutron/v2_0/__init__.py
@@ -426,12 +426,12 @@ class NeutronCommand(command.OpenStackCommand):
         parser = super(NeutronCommand, self).get_parser(prog_name)
         parser.add_argument(
             '--request-format',
-            help=_('The XML or JSON request format.'),
+            help=_('DEPRECATED! Only JSON request format is supported.'),
             default='json',
-            choices=['json', 'xml', ], )
+            choices=['json', ], )
         parser.add_argument(
             '--request_format',
-            choices=['json', 'xml', ],
+            choices=['json', ],
             help=argparse.SUPPRESS)
 
         return parser
@@ -486,7 +486,6 @@ class CreateCommand(NeutronCommand, show.ShowOne):
         self.log.debug('get_data(%s)' % parsed_args)
         self.set_extra_attrs(parsed_args)
         neutron_client = self.get_client()
-        neutron_client.format = parsed_args.request_format
         _extra_values = parse_args_to_dict(self.values_specs)
         _merge_args(self, parsed_args, _extra_values,
                     self.values_specs)
@@ -531,7 +530,6 @@ class UpdateCommand(NeutronCommand):
         self.log.debug('run(%s)', parsed_args)
         self.set_extra_attrs(parsed_args)
         neutron_client = self.get_client()
-        neutron_client.format = parsed_args.request_format
         _extra_values = parse_args_to_dict(self.values_specs)
         _merge_args(self, parsed_args, _extra_values,
                     self.values_specs)
@@ -587,7 +585,6 @@ class DeleteCommand(NeutronCommand):
         self.log.debug('run(%s)', parsed_args)
         self.set_extra_attrs(parsed_args)
         neutron_client = self.get_client()
-        neutron_client.format = parsed_args.request_format
         obj_deleter = getattr(neutron_client,
                               "delete_%s" % self.cmd_resource)
         if self.allow_names:
@@ -654,7 +651,6 @@ class ListCommand(NeutronCommand, lister.Lister):
     def retrieve_list(self, parsed_args):
         """Retrieve a list of resources from Neutron server."""
         neutron_client = self.get_client()
-        neutron_client.format = parsed_args.request_format
         _extra_values = parse_args_to_dict(self.values_specs)
         _merge_args(self, parsed_args, _extra_values,
                     self.values_specs)
@@ -742,7 +738,6 @@ class ShowCommand(NeutronCommand, show.ShowOne):
         self.log.debug('get_data(%s)', parsed_args)
         self.set_extra_attrs(parsed_args)
         neutron_client = self.get_client()
-        neutron_client.format = parsed_args.request_format
 
         params = {}
         if parsed_args.show_details:
diff --git a/neutronclient/neutron/v2_0/agentscheduler.py b/neutronclient/neutron/v2_0/agentscheduler.py
index b1345637c..59a01fbee 100644
--- a/neutronclient/neutron/v2_0/agentscheduler.py
+++ b/neutronclient/neutron/v2_0/agentscheduler.py
@@ -41,7 +41,6 @@ class AddNetworkToDhcpAgent(neutronV20.NeutronCommand):
     def run(self, parsed_args):
         self.log.debug('run(%s)' % parsed_args)
         neutron_client = self.get_client()
-        neutron_client.format = parsed_args.request_format
         _net_id = neutronV20.find_resourceid_by_name_or_id(
             neutron_client, 'network', parsed_args.network)
         neutron_client.add_network_to_dhcp_agent(parsed_args.dhcp_agent,
@@ -66,7 +65,6 @@ class RemoveNetworkFromDhcpAgent(neutronV20.NeutronCommand):
     def run(self, parsed_args):
         self.log.debug('run(%s)' % parsed_args)
         neutron_client = self.get_client()
-        neutron_client.format = parsed_args.request_format
         _net_id = neutronV20.find_resourceid_by_name_or_id(
             neutron_client, 'network', parsed_args.network)
         neutron_client.remove_network_from_dhcp_agent(
@@ -139,7 +137,6 @@ class AddRouterToL3Agent(neutronV20.NeutronCommand):
     def run(self, parsed_args):
         self.log.debug('run(%s)' % parsed_args)
         neutron_client = self.get_client()
-        neutron_client.format = parsed_args.request_format
         _id = neutronV20.find_resourceid_by_name_or_id(
             neutron_client, 'router', parsed_args.router)
         neutron_client.add_router_to_l3_agent(parsed_args.l3_agent,
@@ -164,7 +161,6 @@ class RemoveRouterFromL3Agent(neutronV20.NeutronCommand):
     def run(self, parsed_args):
         self.log.debug('run(%s)' % parsed_args)
         neutron_client = self.get_client()
-        neutron_client.format = parsed_args.request_format
         _id = neutronV20.find_resourceid_by_name_or_id(
             neutron_client, 'router', parsed_args.router)
         neutron_client.remove_router_from_l3_agent(
diff --git a/neutronclient/neutron/v2_0/flavor/flavor.py b/neutronclient/neutron/v2_0/flavor/flavor.py
index a8a1055fa..c53db3e27 100644
--- a/neutronclient/neutron/v2_0/flavor/flavor.py
+++ b/neutronclient/neutron/v2_0/flavor/flavor.py
@@ -120,7 +120,6 @@ class AssociateFlavor(neutronV20.NeutronCommand):
 
     def run(self, parsed_args):
         neutron_client = self.get_client()
-        neutron_client.format = parsed_args.request_format
         flavor_id = neutronV20.find_resourceid_by_name_or_id(
             neutron_client, 'flavor', parsed_args.flavor)
         service_profile_id = neutronV20.find_resourceid_by_id(
@@ -154,7 +153,6 @@ class DisassociateFlavor(neutronV20.NeutronCommand):
 
     def run(self, parsed_args):
         neutron_client = self.get_client()
-        neutron_client.format = parsed_args.request_format
         flavor_id = neutronV20.find_resourceid_by_name_or_id(
             neutron_client, 'flavor', parsed_args.flavor)
         service_profile_id = neutronV20.find_resourceid_by_id(
diff --git a/neutronclient/neutron/v2_0/floatingip.py b/neutronclient/neutron/v2_0/floatingip.py
index c6b3345f5..c603d2f28 100644
--- a/neutronclient/neutron/v2_0/floatingip.py
+++ b/neutronclient/neutron/v2_0/floatingip.py
@@ -114,7 +114,6 @@ class AssociateFloatingIP(neutronV20.NeutronCommand):
     def run(self, parsed_args):
         self.log.debug('run(%s)' % parsed_args)
         neutron_client = self.get_client()
-        neutron_client.format = parsed_args.request_format
         update_dict = {}
         neutronV20.update_dict(parsed_args, update_dict,
                                ['port_id', 'fixed_ip_address'])
@@ -141,7 +140,6 @@ class DisassociateFloatingIP(neutronV20.NeutronCommand):
     def run(self, parsed_args):
         self.log.debug('run(%s)' % parsed_args)
         neutron_client = self.get_client()
-        neutron_client.format = parsed_args.request_format
         neutron_client.update_floatingip(parsed_args.floatingip_id,
                                          {'floatingip': {'port_id': None}})
         print(_('Disassociated floating IP %s') % parsed_args.floatingip_id,
diff --git a/neutronclient/neutron/v2_0/fw/firewallpolicy.py b/neutronclient/neutron/v2_0/fw/firewallpolicy.py
index 1a6d062fc..c0720eab5 100644
--- a/neutronclient/neutron/v2_0/fw/firewallpolicy.py
+++ b/neutronclient/neutron/v2_0/fw/firewallpolicy.py
@@ -170,7 +170,6 @@ class FirewallPolicyInsertRule(neutronv20.UpdateCommand):
 
     def run(self, parsed_args):
         neutron_client = self.get_client()
-        neutron_client.format = parsed_args.request_format
         body = self.args2body(parsed_args)
         _id = neutronv20.find_resourceid_by_name_or_id(neutron_client,
                                                        self.resource,
@@ -209,7 +208,6 @@ class FirewallPolicyRemoveRule(neutronv20.UpdateCommand):
 
     def run(self, parsed_args):
         neutron_client = self.get_client()
-        neutron_client.format = parsed_args.request_format
         body = self.args2body(parsed_args)
         _id = neutronv20.find_resourceid_by_name_or_id(neutron_client,
                                                        self.resource,
diff --git a/neutronclient/neutron/v2_0/lb/healthmonitor.py b/neutronclient/neutron/v2_0/lb/healthmonitor.py
index 1da7eb01c..8b1a1a110 100644
--- a/neutronclient/neutron/v2_0/lb/healthmonitor.py
+++ b/neutronclient/neutron/v2_0/lb/healthmonitor.py
@@ -126,7 +126,6 @@ class AssociateHealthMonitor(neutronV20.NeutronCommand):
 
     def run(self, parsed_args):
         neutron_client = self.get_client()
-        neutron_client.format = parsed_args.request_format
         body = {'health_monitor': {'id': parsed_args.health_monitor_id}}
         pool_id = neutronV20.find_resourceid_by_name_or_id(
             neutron_client, 'pool', parsed_args.pool_id)
@@ -153,7 +152,6 @@ class DisassociateHealthMonitor(neutronV20.NeutronCommand):
 
     def run(self, parsed_args):
         neutron_client = self.get_client()
-        neutron_client.format = parsed_args.request_format
         pool_id = neutronV20.find_resourceid_by_name_or_id(
             neutron_client, 'pool', parsed_args.pool_id)
         neutron_client.disassociate_health_monitor(pool_id,
diff --git a/neutronclient/neutron/v2_0/lb/pool.py b/neutronclient/neutron/v2_0/lb/pool.py
index 849e1c4bf..b0674fcb8 100644
--- a/neutronclient/neutron/v2_0/lb/pool.py
+++ b/neutronclient/neutron/v2_0/lb/pool.py
@@ -110,7 +110,6 @@ class RetrievePoolStats(neutronV20.ShowCommand):
     def get_data(self, parsed_args):
         self.log.debug('run(%s)' % parsed_args)
         neutron_client = self.get_client()
-        neutron_client.format = parsed_args.request_format
         pool_id = neutronV20.find_resourceid_by_name_or_id(
             self.get_client(), 'pool', parsed_args.id)
         params = {}
diff --git a/neutronclient/neutron/v2_0/metering.py b/neutronclient/neutron/v2_0/metering.py
index ea793c3bd..aa79ce1ef 100644
--- a/neutronclient/neutron/v2_0/metering.py
+++ b/neutronclient/neutron/v2_0/metering.py
@@ -101,7 +101,6 @@ class CreateMeteringLabelRule(neutronv20.CreateCommand):
 
     def args2body(self, parsed_args):
         neutron_client = self.get_client()
-        neutron_client.format = parsed_args.request_format
         label_id = neutronv20.find_resourceid_by_name_or_id(
             neutron_client, 'metering_label', parsed_args.label_id)
 
diff --git a/neutronclient/neutron/v2_0/nsx/networkgateway.py b/neutronclient/neutron/v2_0/nsx/networkgateway.py
index 124d7bbad..515b87d6b 100644
--- a/neutronclient/neutron/v2_0/nsx/networkgateway.py
+++ b/neutronclient/neutron/v2_0/nsx/networkgateway.py
@@ -237,7 +237,6 @@ class ConnectNetworkGateway(NetworkGatewayInterfaceCommand):
     def run(self, parsed_args):
         self.log.debug('run(%s)' % parsed_args)
         neutron_client = self.get_client()
-        neutron_client.format = parsed_args.request_format
         (gateway_id, network_id) = self.retrieve_ids(neutron_client,
                                                      parsed_args)
         neutron_client.connect_network_gateway(
@@ -256,7 +255,6 @@ class DisconnectNetworkGateway(NetworkGatewayInterfaceCommand):
     def run(self, parsed_args):
         self.log.debug('run(%s)' % parsed_args)
         neutron_client = self.get_client()
-        neutron_client.format = parsed_args.request_format
         (gateway_id, network_id) = self.retrieve_ids(neutron_client,
                                                      parsed_args)
         neutron_client.disconnect_network_gateway(
diff --git a/neutronclient/neutron/v2_0/port.py b/neutronclient/neutron/v2_0/port.py
index e98e0f00d..49a2610c2 100644
--- a/neutronclient/neutron/v2_0/port.py
+++ b/neutronclient/neutron/v2_0/port.py
@@ -113,7 +113,6 @@ class ListRouterPort(neutronV20.ListCommand):
 
     def get_data(self, parsed_args):
         neutron_client = self.get_client()
-        neutron_client.format = parsed_args.request_format
         _id = neutronV20.find_resourceid_by_name_or_id(
             neutron_client, 'router', parsed_args.id)
         self.values_specs.append('--device_id=%s' % _id)
diff --git a/neutronclient/neutron/v2_0/quota.py b/neutronclient/neutron/v2_0/quota.py
index 03ab64de6..eb750744a 100644
--- a/neutronclient/neutron/v2_0/quota.py
+++ b/neutronclient/neutron/v2_0/quota.py
@@ -53,7 +53,6 @@ class DeleteQuota(neutronV20.NeutronCommand):
     def run(self, parsed_args):
         self.log.debug('run(%s)' % parsed_args)
         neutron_client = self.get_client()
-        neutron_client.format = parsed_args.request_format
         tenant_id = get_tenant_id(parsed_args.tenant_id,
                                   neutron_client)
         obj_deleter = getattr(neutron_client,
@@ -81,7 +80,6 @@ class ListQuota(neutronV20.NeutronCommand, lister.Lister):
         neutron_client = self.get_client()
         search_opts = {}
         self.log.debug('search options: %s', search_opts)
-        neutron_client.format = parsed_args.request_format
         obj_lister = getattr(neutron_client,
                              "list_%ss" % self.resource)
         data = obj_lister(**search_opts)
@@ -114,7 +112,6 @@ class ShowQuota(neutronV20.NeutronCommand, show.ShowOne):
     def get_data(self, parsed_args):
         self.log.debug('get_data(%s)', parsed_args)
         neutron_client = self.get_client()
-        neutron_client.format = parsed_args.request_format
         tenant_id = get_tenant_id(parsed_args.tenant_id,
                                   neutron_client)
         params = {}
@@ -212,7 +209,6 @@ class UpdateQuota(neutronV20.NeutronCommand, show.ShowOne):
     def get_data(self, parsed_args):
         self.log.debug('run(%s)', parsed_args)
         neutron_client = self.get_client()
-        neutron_client.format = parsed_args.request_format
         _extra_values = neutronV20.parse_args_to_dict(self.values_specs)
         neutronV20._merge_args(self, parsed_args, _extra_values,
                                self.values_specs)
diff --git a/neutronclient/neutron/v2_0/rbac.py b/neutronclient/neutron/v2_0/rbac.py
index ace6613f1..79c991d12 100644
--- a/neutronclient/neutron/v2_0/rbac.py
+++ b/neutronclient/neutron/v2_0/rbac.py
@@ -67,7 +67,6 @@ class CreateRBACPolicy(neutronV20.CreateCommand):
 
     def args2body(self, parsed_args):
         neutron_client = self.get_client()
-        neutron_client.format = parsed_args.request_format
         _object_id = get_rbac_object_id(neutron_client, parsed_args.type,
                                         parsed_args.name)
         body = {
diff --git a/neutronclient/neutron/v2_0/router.py b/neutronclient/neutron/v2_0/router.py
index 4c9a83c26..c2d159b24 100644
--- a/neutronclient/neutron/v2_0/router.py
+++ b/neutronclient/neutron/v2_0/router.py
@@ -160,7 +160,6 @@ class RouterInterfaceCommand(neutronV20.NeutronCommand):
     def run(self, parsed_args):
         self.log.debug('run(%s)' % parsed_args)
         neutron_client = self.get_client()
-        neutron_client.format = parsed_args.request_format
 
         if '=' in parsed_args.interface:
             resource, value = parsed_args.interface.split('=', 1)
@@ -232,7 +231,6 @@ class SetGatewayRouter(neutronV20.NeutronCommand):
     def run(self, parsed_args):
         self.log.debug('run(%s)' % parsed_args)
         neutron_client = self.get_client()
-        neutron_client.format = parsed_args.request_format
         _router_id = neutronV20.find_resourceid_by_name_or_id(
             neutron_client, self.resource, parsed_args.router)
         _ext_net_id = neutronV20.find_resourceid_by_name_or_id(
@@ -272,7 +270,6 @@ class RemoveGatewayRouter(neutronV20.NeutronCommand):
     def run(self, parsed_args):
         self.log.debug('run(%s)' % parsed_args)
         neutron_client = self.get_client()
-        neutron_client.format = parsed_args.request_format
         _router_id = neutronV20.find_resourceid_by_name_or_id(
             neutron_client, self.resource, parsed_args.router)
         neutron_client.remove_gateway_router(_router_id)
diff --git a/neutronclient/tests/unit/fw/test_cli20_firewall.py b/neutronclient/tests/unit/fw/test_cli20_firewall.py
index fdcbda6b2..c764139f7 100644
--- a/neutronclient/tests/unit/fw/test_cli20_firewall.py
+++ b/neutronclient/tests/unit/fw/test_cli20_firewall.py
@@ -161,7 +161,3 @@ class CLITestV20FirewallJSON(test_cli20.CLITestV20Base):
         my_id = 'my-id'
         args = [my_id]
         self._test_delete_resource(resource, cmd, my_id, args)
-
-
-class CLITestV20FirewallXML(CLITestV20FirewallJSON):
-    format = 'xml'
diff --git a/neutronclient/tests/unit/fw/test_cli20_firewallpolicy.py b/neutronclient/tests/unit/fw/test_cli20_firewallpolicy.py
index 703b7cd2e..b1e20c675 100644
--- a/neutronclient/tests/unit/fw/test_cli20_firewallpolicy.py
+++ b/neutronclient/tests/unit/fw/test_cli20_firewallpolicy.py
@@ -182,7 +182,6 @@ class CLITestV20FirewallPolicyJSON(test_cli20.CLITestV20Base):
             headers=mox.ContainsKeyValue(
                 'X-Auth-Token',
                 test_cli20.TOKEN)).AndReturn((test_cli20.MyResp(204), None))
-        args.extend(['--request-format', self.format])
         self.mox.ReplayAll()
         cmd_parser = cmd.get_parser(resource + "_insert_rule")
         shell.run_command(cmd, cmd_parser, args)
@@ -213,13 +212,8 @@ class CLITestV20FirewallPolicyJSON(test_cli20.CLITestV20Base):
             headers=mox.ContainsKeyValue(
                 'X-Auth-Token',
                 test_cli20.TOKEN)).AndReturn((test_cli20.MyResp(204), None))
-        args.extend(['--request-format', self.format])
         self.mox.ReplayAll()
         cmd_parser = cmd.get_parser(resource + "_remove_rule")
         shell.run_command(cmd, cmd_parser, args)
         self.mox.VerifyAll()
         self.mox.UnsetStubs()
-
-
-class CLITestV20FirewallPolicyXML(CLITestV20FirewallPolicyJSON):
-    format = 'xml'
diff --git a/neutronclient/tests/unit/fw/test_cli20_firewallrule.py b/neutronclient/tests/unit/fw/test_cli20_firewallrule.py
index 72f80288e..905c81c94 100644
--- a/neutronclient/tests/unit/fw/test_cli20_firewallrule.py
+++ b/neutronclient/tests/unit/fw/test_cli20_firewallrule.py
@@ -178,7 +178,3 @@ class CLITestV20FirewallRuleJSON(test_cli20.CLITestV20Base):
         my_id = 'myid1'
         args = [my_id]
         self._test_delete_resource(resource, cmd, my_id, args)
-
-
-class CLITestV20FirewallRuleXML(CLITestV20FirewallRuleJSON):
-    format = 'xml'
diff --git a/neutronclient/tests/unit/lb/test_cli20_healthmonitor.py b/neutronclient/tests/unit/lb/test_cli20_healthmonitor.py
index 300fa678e..6895b5ee5 100644
--- a/neutronclient/tests/unit/lb/test_cli20_healthmonitor.py
+++ b/neutronclient/tests/unit/lb/test_cli20_healthmonitor.py
@@ -201,7 +201,3 @@ class CLITestV20LbHealthmonitorJSON(test_cli20.CLITestV20Base):
         cmd.run(parsed_args)
         self.mox.VerifyAll()
         self.mox.UnsetStubs()
-
-
-class CLITestV20LbHealthmonitorXML(CLITestV20LbHealthmonitorJSON):
-    format = 'xml'
diff --git a/neutronclient/tests/unit/lb/test_cli20_member.py b/neutronclient/tests/unit/lb/test_cli20_member.py
index 731459d24..7942432a4 100644
--- a/neutronclient/tests/unit/lb/test_cli20_member.py
+++ b/neutronclient/tests/unit/lb/test_cli20_member.py
@@ -117,7 +117,3 @@ class CLITestV20LbMemberJSON(test_cli20.CLITestV20Base):
         my_id = 'my-id'
         args = [my_id]
         self._test_delete_resource(resource, cmd, my_id, args)
-
-
-class CLITestV20LbMemberXML(CLITestV20LbMemberJSON):
-    format = 'xml'
diff --git a/neutronclient/tests/unit/lb/test_cli20_pool.py b/neutronclient/tests/unit/lb/test_cli20_pool.py
index dc9f6b5b0..82fa42d2d 100644
--- a/neutronclient/tests/unit/lb/test_cli20_pool.py
+++ b/neutronclient/tests/unit/lb/test_cli20_pool.py
@@ -164,7 +164,3 @@ class CLITestV20LbPoolJSON(test_cli20.CLITestV20Base):
         _str = self.fake_stdout.make_string()
         self.assertIn('bytes_in', _str)
         self.assertIn('bytes_out', _str)
-
-
-class CLITestV20LbPoolXML(CLITestV20LbPoolJSON):
-    format = 'xml'
diff --git a/neutronclient/tests/unit/lb/test_cli20_vip.py b/neutronclient/tests/unit/lb/test_cli20_vip.py
index a3229033e..3f2f34594 100644
--- a/neutronclient/tests/unit/lb/test_cli20_vip.py
+++ b/neutronclient/tests/unit/lb/test_cli20_vip.py
@@ -205,7 +205,3 @@ class CLITestV20LbVipJSON(test_cli20.CLITestV20Base):
         my_id = 'my-id'
         args = [my_id]
         self._test_delete_resource(resource, cmd, my_id, args)
-
-
-class CLITestV20LbVipXML(CLITestV20LbVipJSON):
-    format = 'xml'
diff --git a/neutronclient/tests/unit/lb/v2/test_cli20_healthmonitor.py b/neutronclient/tests/unit/lb/v2/test_cli20_healthmonitor.py
index 590700082..415e29f97 100644
--- a/neutronclient/tests/unit/lb/v2/test_cli20_healthmonitor.py
+++ b/neutronclient/tests/unit/lb/v2/test_cli20_healthmonitor.py
@@ -148,7 +148,3 @@ class CLITestV20LbHealthMonitorJSON(test_cli20.CLITestV20Base):
         args = [my_id]
         self._test_delete_resource(resource, cmd, my_id, args,
                                    cmd_resource=cmd_resource)
-
-
-class CLITestV20LbHealthMonitorXML(CLITestV20LbHealthMonitorJSON):
-    format = 'xml'
diff --git a/neutronclient/tests/unit/lb/v2/test_cli20_listener.py b/neutronclient/tests/unit/lb/v2/test_cli20_listener.py
index 6ecac35b5..e290ac823 100644
--- a/neutronclient/tests/unit/lb/v2/test_cli20_listener.py
+++ b/neutronclient/tests/unit/lb/v2/test_cli20_listener.py
@@ -134,7 +134,3 @@ class CLITestV20LbListenerJSON(test_cli20.CLITestV20Base):
         args = [my_id]
         self._test_delete_resource(resource, cmd, my_id, args,
                                    cmd_resource=cmd_resource)
-
-
-class CLITestV20LbListenerXML(CLITestV20LbListenerJSON):
-    format = 'xml'
diff --git a/neutronclient/tests/unit/lb/v2/test_cli20_loadbalancer.py b/neutronclient/tests/unit/lb/v2/test_cli20_loadbalancer.py
index e96df15cf..f0c7457b1 100644
--- a/neutronclient/tests/unit/lb/v2/test_cli20_loadbalancer.py
+++ b/neutronclient/tests/unit/lb/v2/test_cli20_loadbalancer.py
@@ -130,7 +130,3 @@ class CLITestV20LbLoadBalancerJSON(test_cli20.CLITestV20Base):
         args = [my_id]
         self._test_delete_resource(resource, cmd, my_id, args,
                                    cmd_resource=cmd_resource)
-
-
-class CLITestV20LbLoadBalancerXML(CLITestV20LbLoadBalancerJSON):
-    format = 'xml'
diff --git a/neutronclient/tests/unit/lb/v2/test_cli20_member.py b/neutronclient/tests/unit/lb/v2/test_cli20_member.py
index 73b329f6d..15ee9ce5f 100644
--- a/neutronclient/tests/unit/lb/v2/test_cli20_member.py
+++ b/neutronclient/tests/unit/lb/v2/test_cli20_member.py
@@ -155,7 +155,3 @@ class CLITestV20LbMemberJSON(test_cli20.CLITestV20Base):
         self._test_delete_resource(resource, cmd, my_id, args,
                                    cmd_resource=cmd_resource,
                                    parent_id=pool_id)
-
-
-class CLITestV20LbMemberXML(CLITestV20LbMemberJSON):
-    format = 'xml'
diff --git a/neutronclient/tests/unit/lb/v2/test_cli20_pool.py b/neutronclient/tests/unit/lb/v2/test_cli20_pool.py
index 48630f893..2ec40f437 100644
--- a/neutronclient/tests/unit/lb/v2/test_cli20_pool.py
+++ b/neutronclient/tests/unit/lb/v2/test_cli20_pool.py
@@ -137,7 +137,3 @@ class CLITestV20LbPoolJSON(test_cli20.CLITestV20Base):
         args = [my_id]
         self._test_delete_resource(resource, cmd, my_id, args,
                                    cmd_resource=cmd_resource)
-
-
-class CLITestV20LbPoolXML(CLITestV20LbPoolJSON):
-    format = 'xml'
diff --git a/neutronclient/tests/unit/test_cli20.py b/neutronclient/tests/unit/test_cli20.py
index 2e609a0bd..febc5863a 100644
--- a/neutronclient/tests/unit/test_cli20.py
+++ b/neutronclient/tests/unit/test_cli20.py
@@ -190,10 +190,7 @@ class CLITestV20Base(base.BaseTestCase):
         client.Client.EXTED_PLURALS.update(constants.PLURALS)
         if plurals is not None:
             client.Client.EXTED_PLURALS.update(plurals)
-        self.metadata = {'plurals': client.Client.EXTED_PLURALS,
-                         'xmlns': constants.XML_NS_V20,
-                         constants.EXT_NS: {'prefix':
-                                            'http://xxxx.yy.com'}}
+        self.metadata = {'plurals': client.Client.EXTED_PLURALS}
         self.mox = mox.Mox()
         self.endurl = ENDURL
         self.fake_stdout = FakeStdout()
@@ -208,6 +205,7 @@ class CLITestV20Base(base.BaseTestCase):
             'neutronclient.v2_0.client.Client.get_attr_metadata',
             self._get_attr_metadata))
         self.client = client.Client(token=TOKEN, endpoint_url=self.endurl)
+        self.client.format = self.format
 
     def register_non_admin_status_resource(self, resource_name):
         # TODO(amotoki):
@@ -254,7 +252,6 @@ class CLITestV20Base(base.BaseTestCase):
                 {self.id_field: myid}, }
         if name:
             ress[resource].update({'name': name})
-        self.client.format = self.format
         resstr = self.client.serialize(ress)
         # url method body
         resource_plural = neutronV2_0._get_resource_plural(cmd_resource,
@@ -262,19 +259,14 @@ class CLITestV20Base(base.BaseTestCase):
         path = getattr(self.client, resource_plural + "_path")
         if parent_id:
             path = path % parent_id
-        # Work around for LP #1217791. XML deserializer called from
-        # MyComparator does not decodes XML string correctly.
-        if self.format == 'json':
-            mox_body = MyComparator(body, self.client)
-        else:
-            mox_body = self.client.serialize(body)
+        mox_body = MyComparator(body, self.client)
+
         if not no_api_call:
             self.client.httpclient.request(
                 end_url(path, format=self.format), 'POST',
                 body=mox_body,
                 headers=mox.ContainsKeyValue(
                     'X-Auth-Token', TOKEN)).AndReturn((MyResp(200), resstr))
-        args.extend(['--request-format', self.format])
         self.mox.ReplayAll()
         cmd_parser = cmd.get_parser('create_' + resource)
         if expected_exception:
@@ -295,7 +287,6 @@ class CLITestV20Base(base.BaseTestCase):
         self.mox.StubOutWithMock(cmd, "get_client")
         self.mox.StubOutWithMock(self.client.httpclient, "request")
         cmd.get_client().MultipleTimes().AndReturn(self.client)
-        self.client.format = self.format
         if not cmd_resources:
             cmd_resources = resources
 
@@ -309,7 +300,6 @@ class CLITestV20Base(base.BaseTestCase):
             body=None,
             headers=mox.ContainsKeyValue(
                 'X-Auth-Token', TOKEN)).AndReturn((MyResp(200), resstr))
-        args = tuple(args) + ('--request-format', self.format)
         self.mox.ReplayAll()
         cmd_parser = cmd.get_parser("list_" + cmd_resources)
         shell.run_command(cmd, cmd_parser, args)
@@ -332,13 +322,11 @@ class CLITestV20Base(base.BaseTestCase):
         else:
             contents = response_contents
         reses = {resources: contents}
-        self.client.format = self.format
         resstr = self.client.serialize(reses)
         # url method body
         args = base_args if base_args is not None else []
         if detail:
             args.append('-D')
-        args.extend(['--request-format', self.format])
         if fields_1:
             for field in fields_1:
                 args.append('--fields')
@@ -438,7 +426,6 @@ class CLITestV20Base(base.BaseTestCase):
                                             'rel': 'next'}]}
         reses2 = {resources: [{'id': 'myid3', },
                               {'id': 'myid4', }]}
-        self.client.format = self.format
         resstr1 = self.client.serialize(reses1)
         resstr2 = self.client.serialize(reses2)
         self.client.httpclient.request(
@@ -455,7 +442,6 @@ class CLITestV20Base(base.BaseTestCase):
         self.mox.ReplayAll()
         cmd_parser = cmd.get_parser("list_" + cmd_resources)
         args = base_args if base_args is not None else []
-        args.extend(['--request-format', self.format])
         shell.run_command(cmd, cmd_parser, args)
         self.mox.VerifyAll()
         self.mox.UnsetStubs()
@@ -474,13 +460,8 @@ class CLITestV20Base(base.BaseTestCase):
             path = path % (parent_id, myid)
         else:
             path = path % myid
-        self.client.format = self.format
-        # Work around for LP #1217791. XML deserializer called from
-        # MyComparator does not decodes XML string correctly.
-        if self.format == 'json':
-            mox_body = MyComparator(body, self.client)
-        else:
-            mox_body = self.client.serialize(body)
+        mox_body = MyComparator(body, self.client)
+
         self.client.httpclient.request(
             MyUrlComparator(end_url(path, format=self.format),
                             self.client),
@@ -488,7 +469,6 @@ class CLITestV20Base(base.BaseTestCase):
             body=mox_body,
             headers=mox.ContainsKeyValue(
                 'X-Auth-Token', TOKEN)).AndReturn((MyResp(204), None))
-        args.extend(['--request-format', self.format])
         self.mox.ReplayAll()
         cmd_parser = cmd.get_parser("update_" + cmd_resource)
         shell.run_command(cmd, cmd_parser, args)
@@ -509,7 +489,6 @@ class CLITestV20Base(base.BaseTestCase):
         expected_res = {resource:
                         {self.id_field: myid,
                          'name': 'myname', }, }
-        self.client.format = self.format
         resstr = self.client.serialize(expected_res)
         path = getattr(self.client, cmd_resource + "_path")
         if parent_id:
@@ -521,7 +500,6 @@ class CLITestV20Base(base.BaseTestCase):
             body=None,
             headers=mox.ContainsKeyValue(
                 'X-Auth-Token', TOKEN)).AndReturn((MyResp(200), resstr))
-        args.extend(['--request-format', self.format])
         self.mox.ReplayAll()
         cmd_parser = cmd.get_parser("show_" + cmd_resource)
         shell.run_command(cmd, cmd_parser, args)
@@ -548,7 +526,6 @@ class CLITestV20Base(base.BaseTestCase):
             body=None,
             headers=mox.ContainsKeyValue(
                 'X-Auth-Token', TOKEN)).AndReturn((MyResp(204), None))
-        args.extend(['--request-format', self.format])
         self.mox.ReplayAll()
         cmd_parser = cmd.get_parser("delete_" + cmd_resource)
         shell.run_command(cmd, cmd_parser, args)
@@ -571,7 +548,6 @@ class CLITestV20Base(base.BaseTestCase):
             body=MyComparator(body, self.client),
             headers=mox.ContainsKeyValue(
                 'X-Auth-Token', TOKEN)).AndReturn((MyResp(204), retval))
-        args.extend(['--request-format', self.format])
         self.mox.ReplayAll()
         cmd_parser = cmd.get_parser("delete_" + cmd_resource)
         shell.run_command(cmd, cmd_parser, args)
@@ -583,7 +559,6 @@ class CLITestV20Base(base.BaseTestCase):
 
 class ClientV2TestJson(CLITestV20Base):
     def test_do_request_unicode(self):
-        self.client.format = self.format
         self.mox.StubOutWithMock(self.client.httpclient, "request")
         unicode_text = u'\u7f51\u7edc'
         # url with unicode
@@ -616,7 +591,6 @@ class ClientV2TestJson(CLITestV20Base):
         self.assertEqual(body, res_body)
 
     def test_do_request_error_without_response_body(self):
-        self.client.format = self.format
         self.mox.StubOutWithMock(self.client.httpclient, "request")
         params = {'test': 'value'}
         expect_query = six.moves.urllib.parse.urlencode(params)
@@ -649,10 +623,6 @@ class ClientV2TestJson(CLITestV20Base):
             self.fail('Expected exception NOT raised')
 
 
-class ClientV2UnicodeTestXML(ClientV2TestJson):
-    format = 'xml'
-
-
 class CLITestV20ExceptionHandler(CLITestV20Base):
 
     def _test_exception_handler_v20(
diff --git a/neutronclient/tests/unit/test_cli20_agentschedulers.py b/neutronclient/tests/unit/test_cli20_agentschedulers.py
index 8085581e1..d9c1f0033 100644
--- a/neutronclient/tests/unit/test_cli20_agentschedulers.py
+++ b/neutronclient/tests/unit/test_cli20_agentschedulers.py
@@ -206,7 +206,3 @@ class CLITestV20LBaaSV2AgentScheduler(test_cli20.CLITestV20Base):
         contents = {self.id_field: 'myid1', 'alive': True}
         self._test_list_resources(resources, cmd, base_args=[lb_id],
                                   path=path, response_contents=contents)
-
-
-class CLITestV20LBaaSAgentSchedulerXML(CLITestV20LBaaSAgentScheduler):
-    format = 'xml'
diff --git a/neutronclient/tests/unit/test_cli20_floatingips.py b/neutronclient/tests/unit/test_cli20_floatingips.py
index f42f145ba..42522e7b2 100644
--- a/neutronclient/tests/unit/test_cli20_floatingips.py
+++ b/neutronclient/tests/unit/test_cli20_floatingips.py
@@ -177,7 +177,3 @@ class CLITestV20FloatingIpsJSON(test_cli20.CLITestV20Base):
         self._test_update_resource(resource, cmd, 'myid',
                                    args, {"port_id": "portid"}
                                    )
-
-
-class CLITestV20FloatingIpsXML(CLITestV20FloatingIpsJSON):
-    format = 'xml'
diff --git a/neutronclient/tests/unit/test_cli20_metering.py b/neutronclient/tests/unit/test_cli20_metering.py
index ad9e99b6c..c51af3770 100644
--- a/neutronclient/tests/unit/test_cli20_metering.py
+++ b/neutronclient/tests/unit/test_cli20_metering.py
@@ -97,7 +97,3 @@ class CLITestV20MeteringJSON(test_cli20.CLITestV20Base):
         args = ['--fields', 'id', self.test_id]
         self._test_show_resource(resource, cmd, self.test_id,
                                  args, ['id'])
-
-
-class CLITestV20MeteringXML(CLITestV20MeteringJSON):
-    format = 'xml'
diff --git a/neutronclient/tests/unit/test_cli20_network.py b/neutronclient/tests/unit/test_cli20_network.py
index dc5ba1e8b..85b281b60 100644
--- a/neutronclient/tests/unit/test_cli20_network.py
+++ b/neutronclient/tests/unit/test_cli20_network.py
@@ -600,7 +600,3 @@ class CLITestV20NetworkJSON(test_cli20.CLITestV20Base):
                         'X-Auth-Token', test_cli20.TOKEN)).AndReturn(response)
 
         self._test_extend_list(mox_calls)
-
-
-class CLITestV20NetworkXML(CLITestV20NetworkJSON):
-    format = 'xml'
diff --git a/neutronclient/tests/unit/test_cli20_nsx_networkgateway.py b/neutronclient/tests/unit/test_cli20_nsx_networkgateway.py
index 0ce2c8121..640578dbe 100644
--- a/neutronclient/tests/unit/test_cli20_nsx_networkgateway.py
+++ b/neutronclient/tests/unit/test_cli20_nsx_networkgateway.py
@@ -261,7 +261,3 @@ class CLITestV20NetworkGatewayJSON(test_cli20.CLITestV20Base):
         args = ['--fields', 'id', '--fields', 'name', self.test_id]
         self._test_show_resource(self.dev_resource, cmd, self.test_id, args,
                                  ['id', 'name'])
-
-
-class CLITestV20NetworkGatewayXML(CLITestV20NetworkGatewayJSON):
-    format = 'xml'
diff --git a/neutronclient/tests/unit/test_cli20_nsx_queue.py b/neutronclient/tests/unit/test_cli20_nsx_queue.py
index 1cbe0c747..901422149 100644
--- a/neutronclient/tests/unit/test_cli20_nsx_queue.py
+++ b/neutronclient/tests/unit/test_cli20_nsx_queue.py
@@ -83,7 +83,3 @@ class CLITestV20QosQueueJSON(test_cli20.CLITestV20Base):
         myid = 'myid'
         args = [myid]
         self._test_delete_resource(resource, cmd, myid, args)
-
-
-class CLITestV20QosQueueXML(CLITestV20QosQueueJSON):
-    format = 'xml'
diff --git a/neutronclient/tests/unit/test_cli20_nuage_netpartition.py b/neutronclient/tests/unit/test_cli20_nuage_netpartition.py
index a9839f523..fc26979cf 100644
--- a/neutronclient/tests/unit/test_cli20_nuage_netpartition.py
+++ b/neutronclient/tests/unit/test_cli20_nuage_netpartition.py
@@ -53,7 +53,3 @@ class CLITestV20NetPartitionJSON(test_cli20.CLITestV20Base):
         myid = 'myid'
         args = [myid]
         self._test_delete_resource(self.resource, cmd, myid, args)
-
-
-class CLITestV20NetPartitionXML(CLITestV20NetPartitionJSON):
-    format = 'xml'
diff --git a/neutronclient/tests/unit/test_cli20_port.py b/neutronclient/tests/unit/test_cli20_port.py
index ad9b2b89d..7cc3bbd18 100644
--- a/neutronclient/tests/unit/test_cli20_port.py
+++ b/neutronclient/tests/unit/test_cli20_port.py
@@ -731,7 +731,3 @@ class CLITestV20PortJSON(test_cli20.CLITestV20Base):
         myid = 'myid'
         args = [myid]
         self._test_delete_resource(resource, cmd, myid, args)
-
-
-class CLITestV20PortXML(CLITestV20PortJSON):
-    format = 'xml'
diff --git a/neutronclient/tests/unit/test_cli20_router.py b/neutronclient/tests/unit/test_cli20_router.py
index 60ee733bd..20534c748 100644
--- a/neutronclient/tests/unit/test_cli20_router.py
+++ b/neutronclient/tests/unit/test_cli20_router.py
@@ -382,7 +382,3 @@ class CLITestV20RouterJSON(test_cli20.CLITestV20Base):
         self._test_update_resource(resource, cmd, 'externalid',
                                    args, {"external_gateway_info": {}}
                                    )
-
-
-class CLITestV20RouterXML(CLITestV20RouterJSON):
-    format = 'xml'
diff --git a/neutronclient/tests/unit/test_cli20_securitygroup.py b/neutronclient/tests/unit/test_cli20_securitygroup.py
index f077c1fcc..19e3c688e 100644
--- a/neutronclient/tests/unit/test_cli20_securitygroup.py
+++ b/neutronclient/tests/unit/test_cli20_securitygroup.py
@@ -609,7 +609,3 @@ class CLITestV20SecurityGroupsJSON(test_cli20.CLITestV20Base):
                          ]
         expected = '\n'.join(sorted(expected_data))
         self.assertEqual(expected, securitygroup._format_sg_rules(sg))
-
-
-class CLITestV20SecurityGroupsXML(CLITestV20SecurityGroupsJSON):
-    format = 'xml'
diff --git a/neutronclient/tests/unit/test_cli20_servicetype.py b/neutronclient/tests/unit/test_cli20_servicetype.py
index 5ee4bd7ce..ec9a663fa 100644
--- a/neutronclient/tests/unit/test_cli20_servicetype.py
+++ b/neutronclient/tests/unit/test_cli20_servicetype.py
@@ -53,7 +53,3 @@ class CLITestV20ServiceProvidersJSON(test_cli20.CLITestV20Base):
         cmd = servicetype.ListServiceProvider(test_cli20.MyApp(sys.stdout),
                                               None)
         self._test_list_resources(resources, cmd, page_size=1000)
-
-
-class CLITestV20ServiceProvidersXML(CLITestV20ServiceProvidersJSON):
-    format = 'xml'
diff --git a/neutronclient/tests/unit/test_cli20_subnet.py b/neutronclient/tests/unit/test_cli20_subnet.py
index a5b1b62eb..84d59e5e7 100644
--- a/neutronclient/tests/unit/test_cli20_subnet.py
+++ b/neutronclient/tests/unit/test_cli20_subnet.py
@@ -574,12 +574,6 @@ class CLITestV20SubnetJSON(test_cli20.CLITestV20Base):
         cmd = subnet.ListSubnet(test_cli20.MyApp(sys.stdout), None)
         self._test_list_resources(resources, cmd, tags=['a', 'b'])
 
-    def test_list_subnets_known_option_after_unknown(self):
-        """List subnets: -- --tags a b --request-format xml."""
-        resources = "subnets"
-        cmd = subnet.ListSubnet(test_cli20.MyApp(sys.stdout), None)
-        self._test_list_resources(resources, cmd, tags=['a', 'b'])
-
     def test_list_subnets_detail_tags(self):
         """List subnets: -D -- --tags a b."""
         resources = "subnets"
@@ -624,36 +618,13 @@ class CLITestV20SubnetJSON(test_cli20.CLITestV20Base):
                                    {'name': 'myname', 'tags': ['a', 'b'], }
                                    )
 
-    def test_update_subnet_known_option_before_id(self):
-        """Update subnet: --request-format json myid --name myname."""
-        # --request-format xml is known option
-        resource = 'subnet'
-        cmd = subnet.UpdateSubnet(test_cli20.MyApp(sys.stdout), None)
-        self._test_update_resource(resource, cmd, 'myid',
-                                   ['--request-format', 'json',
-                                    'myid', '--name', 'myname'],
-                                   {'name': 'myname', }
-                                   )
-
-    def test_update_subnet_known_option_after_id(self):
-        """Update subnet: myid --name myname --request-format json."""
-        # --request-format xml is known option
-        resource = 'subnet'
-        cmd = subnet.UpdateSubnet(test_cli20.MyApp(sys.stdout), None)
-        self._test_update_resource(resource, cmd, 'myid',
-                                   ['myid', '--name', 'myname',
-                                    '--request-format', 'json'],
-                                   {'name': 'myname', }
-                                   )
-
     def test_update_subnet_allocation_pools(self):
         """Update subnet: myid --name myname --tags a b."""
         resource = 'subnet'
         cmd = subnet.UpdateSubnet(test_cli20.MyApp(sys.stdout), None)
         self._test_update_resource(resource, cmd, 'myid',
                                    ['myid', '--allocation-pool',
-                                    'start=1.2.0.2,end=1.2.0.127',
-                                    '--request-format', 'json'],
+                                    'start=1.2.0.2,end=1.2.0.127'],
                                    {'allocation_pools': [{'start': '1.2.0.2',
                                                           'end': '1.2.0.127'}]}
                                    )
@@ -687,7 +658,3 @@ class CLITestV20SubnetJSON(test_cli20.CLITestV20Base):
         myid = 'myid'
         args = [myid]
         self._test_delete_resource(resource, cmd, myid, args)
-
-
-class CLITestV20SubnetXML(CLITestV20SubnetJSON):
-    format = 'xml'
diff --git a/neutronclient/tests/unit/test_http.py b/neutronclient/tests/unit/test_http.py
index 761cc6fa8..d16f87b32 100644
--- a/neutronclient/tests/unit/test_http.py
+++ b/neutronclient/tests/unit/test_http.py
@@ -59,17 +59,17 @@ class TestHTTPClientMixin(object):
         self._test_headers(headers, body=BODY)
 
     def test_headers_without_body_with_content_type(self):
-        headers = {'Accept': 'application/xml'}
-        self._test_headers(headers, content_type='application/xml')
+        headers = {'Accept': 'application/json'}
+        self._test_headers(headers, content_type='application/json')
 
     def test_headers_with_body_with_content_type(self):
-        headers = {'Accept': 'application/xml',
-                   'Content-Type': 'application/xml'}
-        self._test_headers(headers, body=BODY, content_type='application/xml')
+        headers = {'Accept': 'application/json',
+                   'Content-Type': 'application/json'}
+        self._test_headers(headers, body=BODY, content_type='application/json')
 
     def test_headers_defined_in_headers(self):
-        headers = {'Accept': 'application/xml',
-                   'Content-Type': 'application/xml'}
+        headers = {'Accept': 'application/json',
+                   'Content-Type': 'application/json'}
         self._test_headers(headers, body=BODY, headers=headers)
 
 
diff --git a/neutronclient/tests/unit/vpn/test_cli20_ikepolicy.py b/neutronclient/tests/unit/vpn/test_cli20_ikepolicy.py
index 604e2cc07..4295fc6ec 100644
--- a/neutronclient/tests/unit/vpn/test_cli20_ikepolicy.py
+++ b/neutronclient/tests/unit/vpn/test_cli20_ikepolicy.py
@@ -207,7 +207,3 @@ class CLITestV20VpnIkePolicyJSON(test_cli20.CLITestV20Base):
         my_id = 'my-id'
         args = [my_id]
         self._test_delete_resource(resource, cmd, my_id, args)
-
-
-class CLITestV20VpnIkePolicyXML(CLITestV20VpnIkePolicyJSON):
-    format = 'xml'
diff --git a/neutronclient/tests/unit/vpn/test_cli20_ipsecpolicy.py b/neutronclient/tests/unit/vpn/test_cli20_ipsecpolicy.py
index d133e5ec3..9d42c6abd 100644
--- a/neutronclient/tests/unit/vpn/test_cli20_ipsecpolicy.py
+++ b/neutronclient/tests/unit/vpn/test_cli20_ipsecpolicy.py
@@ -204,7 +204,3 @@ class CLITestV20VpnIpsecPolicyJSON(test_cli20.CLITestV20Base):
         my_id = 'my-id'
         args = [my_id]
         self._test_delete_resource(resource, cmd, my_id, args)
-
-
-class CLITestV20VpnIpsecPolicyXML(CLITestV20VpnIpsecPolicyJSON):
-    format = 'xml'
diff --git a/neutronclient/v2_0/client.py b/neutronclient/v2_0/client.py
index da8a9a48d..469c36e44 100644
--- a/neutronclient/v2_0/client.py
+++ b/neutronclient/v2_0/client.py
@@ -24,7 +24,6 @@ import requests
 import six.moves.urllib.parse as urlparse
 
 from neutronclient import client
-from neutronclient.common import constants
 from neutronclient.common import exceptions
 from neutronclient.common import extension as client_extension
 from neutronclient.common import serializer
@@ -195,9 +194,7 @@ class ClientBase(object):
         if body:
             body = self.serialize(body)
 
-        resp, replybody = self.httpclient.do_request(
-            action, method, body=body,
-            content_type=self.content_type())
+        resp, replybody = self.httpclient.do_request(action, method, body=body)
 
         status_code = resp.status_code
         if status_code in (requests.codes.ok,
@@ -214,7 +211,7 @@ class ClientBase(object):
         return self.httpclient.get_auth_info()
 
     def serialize(self, data):
-        """Serializes a dictionary into either XML or JSON.
+        """Serializes a dictionary into JSON.
 
         A dictionary with a single key can be passed and it can contain any
         structure.
@@ -222,39 +219,17 @@ class ClientBase(object):
         if data is None:
             return None
         elif type(data) is dict:
-            return serializer.Serializer(
-                self.get_attr_metadata()).serialize(data, self.content_type())
+            return serializer.Serializer().serialize(data)
         else:
             raise Exception(_("Unable to serialize object of type = '%s'") %
                             type(data))
 
     def deserialize(self, data, status_code):
-        """Deserializes an XML or JSON string into a dictionary."""
+        """Deserializes a JSON string into a dictionary."""
         if status_code == 204:
             return data
-        return serializer.Serializer(self.get_attr_metadata()).deserialize(
-            data, self.content_type())['body']
-
-    def get_attr_metadata(self):
-        if self.format == 'json':
-            return {}
-        old_request_format = self.format
-        self.format = 'json'
-        exts = self.list_extensions()['extensions']
-        self.format = old_request_format
-        ns = dict([(ext['alias'], ext['namespace']) for ext in exts])
-        self.EXTED_PLURALS.update(constants.PLURALS)
-        return {'plurals': self.EXTED_PLURALS,
-                'xmlns': constants.XML_NS_V20,
-                constants.EXT_NS: ns}
-
-    def content_type(self, _format=None):
-        """Returns the mime-type for either 'xml' or 'json'.
-
-        Defaults to the currently set format.
-        """
-        _format = _format or self.format
-        return "application/%s" % (_format)
+        return serializer.Serializer().deserialize(
+            data)['body']
 
     def retry_request(self, method, action, body=None,
                       headers=None, params=None):
diff --git a/releasenotes/notes/drop-xml-support-41babecb1784d996.yaml b/releasenotes/notes/drop-xml-support-41babecb1784d996.yaml
new file mode 100644
index 000000000..23c95e688
--- /dev/null
+++ b/releasenotes/notes/drop-xml-support-41babecb1784d996.yaml
@@ -0,0 +1,5 @@
+---
+upgrade:
+  - XML request format support has been removed.
+deprecations:
+  - request-format option is deprecated.