diff --git a/codegenerator/common/schema.py b/codegenerator/common/schema.py
index 3dce6be..2e9b429 100644
--- a/codegenerator/common/schema.py
+++ b/codegenerator/common/schema.py
@@ -90,6 +90,7 @@ class ParameterSchema(BaseModel):
     deprecated: bool = False
     style: str | None = None
     explode: bool | None = None
+    uniqueItems: bool | None = None
     ref: str = Field(alias="$ref", default=None)
     openstack: Dict[str, Any] = Field(alias="x-openstack", default=None)
 
diff --git a/codegenerator/model.py b/codegenerator/model.py
index 9a4b3cd..d45823a 100644
--- a/codegenerator/model.py
+++ b/codegenerator/model.py
@@ -764,7 +764,10 @@ class OpenAPISchemaParser(JsonSchemaParser):
                 if style == "form" and not explode:
                     dt = CommaSeparatedList(item_type=ConstraintString())
                 elif style == "form" and explode:
-                    dt = Set(item_type=ConstraintString())
+                    if not param_schema.get("uniqueItems", False):
+                        dt = Array(item_type=ConstraintString())
+                    else:
+                        dt = Set(item_type=ConstraintString())
                 else:
                     raise NotImplementedError(
                         f"Parameter serialization {schema} not supported"
diff --git a/codegenerator/templates/rust_sdk/impl.rs.j2 b/codegenerator/templates/rust_sdk/impl.rs.j2
index 80453f4..c9af0c7 100644
--- a/codegenerator/templates/rust_sdk/impl.rs.j2
+++ b/codegenerator/templates/rust_sdk/impl.rs.j2
@@ -166,18 +166,28 @@ impl{{ type_manager.get_request_static_lifetimes(request) }} RestEndpoint for Re
     {%- if type_manager.parameters.values()|selectattr("location", "equalto", "query")|list|length > 0 %}
         let mut params = QueryParams::default();
 
-     {%- for param in type_manager.parameters.values() %}
-     {%- if param.location == "query" %}
+   {%- for param in type_manager.parameters.values() %}
+    {%- if param.location == "query" %}
      {%- if param.data_type.__class__.__name__ == "Null" %}
      params.push_opt_key_only(
          "{{ param.remote_name }}",
          self.{{ param.local_name }}.as_ref()
      );
-     {%- elif not param.type_hint.startswith("BTreeSet") %}
-      {%- if param.is_required %}
-     params.push(
+     {%- elif param.data_type.__class__.__name__ == "Array" %}
+      {%- if not param.is_required %}
+       if let Some(val) = &self.{{ param.local_name }} {
+         params.extend(val.iter().map(|value| ("{{ param.remote_name }}", value)));
+       }
       {%- else %}
-     params.push_opt(
+       params.extend(self.{{ param.local_name }}.iter().map(|value| ("{{ param.remote_name }}", value)));
+      {%- endif %}
+     {%- elif param.type_hint.startswith("BTreeSet") %}
+       params.extend(self.{{ param.local_name }}.iter().map(|value| ("{{ param.remote_name }}", value)));
+     {%- else %}
+      {%- if param.is_required %}
+       params.push(
+      {%- else %}
+       params.push_opt(
       {%- endif %}
          "{{ param.remote_name }}",
          self.{{ param.local_name}}
@@ -185,11 +195,9 @@ impl{{ type_manager.get_request_static_lifetimes(request) }} RestEndpoint for Re
          .as_ref()
          {%- endif %}
      );
-     {%- else %}
-     params.extend(self.{{ param.local_name }}.iter().map(|value| ("{{ param.remote_name }}", value)));
      {%- endif %}
-     {%- endif %}
-     {%- endfor %}
+    {%- endif %}
+   {%- endfor %}
 
         params
     {%- else %}