Serialized response formats

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 define the response format, use one of these methods:



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:


Plain text response format. The default.


JSON data serialization response format.


XML data serialization response format.


XML data serialization response format.

Example 1. JSON example with format query parameter

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:


Example 2. XML example with Accept header

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">

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.