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By default, the Object Storage API uses a text/plain response format. In addition, both JSON and XML data serialization response formats are supported. To run the cURL command examples, you must export environment variables. To define the response format, use one of these methods: Method Description format=format query parameter Append this parameter to the URL for a &GET; request, where format is json or xml. Accept request header Include this header in the &GET; request. The valid header values are: text/plain. Plain text response format. The default. application/json. JSON data serialization response format. application/xml or text/xml. XML data serialization response format. For example, this request uses the format query parameter to ask for a JSON response: # curl -i $publicURL?format=json -X GET -H "X-Auth-Token: $token" HTTP/1.1 200 OK Content-Length: 96 X-Account-Object-Count: 1 X-Timestamp: 1389453423.35964 X-Account-Meta-Subject: Literature X-Account-Bytes-Used: 14 X-Account-Container-Count: 2 Content-Type: application/json; charset=utf-8 Accept-Ranges: bytes X-Trans-Id: tx274a77a8975c4a66aeb24-0052d95365 Date: Fri, 17 Jan 2014 15:59:33 GMT Object Storage lists container names with additional information in JSON format: [ { "count":0, "bytes":0, "name":"janeausten" }, { "count":1, "bytes":14, "name":"marktwain" } ] This request uses the Accept request header to ask for an XML response: # curl -i $publicURL -X GET -H "X-Auth-Token: $token" -H "Accept: application/xml; charset=utf-8" HTTP/1.1 200 OK Content-Length: 263 X-Account-Object-Count: 3 X-Account-Meta-Book: MobyDick X-Timestamp: 1389453423.35964 X-Account-Bytes-Used: 47 X-Account-Container-Count: 2 Content-Type: application/xml; charset=utf-8 Accept-Ranges: bytes X-Trans-Id: txf0b4c9727c3e491694019-0052e03420 Date: Wed, 22 Jan 2014 21:12:00 GMT Object Storage lists container names with additional information in XML format: <?xml version="1.0" encoding="UTF-8"?> <account name="AUTH_73f0aa26640f4971864919d0eb0f0880"> <container> <name>janeausten</name> <count>2</count> <bytes>33</bytes> </container> <container> <name>marktwain</name> <count>1</count> <bytes>14</bytes> </container> </account> The remainder of the examples in this guide use standard, non-serialized responses. However, all &GET; requests that perform list operations accept the format query parameter or Accept request header.