The Keystone API supports both the JSON and XML data
serialization formats. The request format is specified
using the Content-Type header and is required
for operations that have a request body. The response
format can be specified in requests either by using
the Accept header or by adding an
.xml or .json extension to
the request URI. It is possible for a response to be
serialized using a format different from the request. If
no response format is specified, JSON is the default. If
conflicting formats are specified using both an
Accept header and a query extension, the
query extension takes precedence.
| Format | Accept Header | Query Extension | Default |
| JSON | application/json | .json | Yes |
| XML | application/xml | .xml | No |
