.RestFixture uses three content handlers to parse and set expectations used to verify the behaviour of HTTP calls.
These are the handlers currently available:
 * '''XML''' interprets the body as an xml string and allows XPath expressions as expectations on that content
 * '''JSON''' interprets the body as a JSON string and allows expectations to be written in JavaScript.
 * '''TEXT''' interprets the body as a string and allows regular expression expectations.

These are the defaults

 * default=XML
 * application/xml=XML
 * application/json=JSON
 * text/plain=TEXT

!*** Note: unrecognised content types.
Content types not recogised will be mapped to the default content handler (XML).
***!

For example, XML handler is used for for content types of application/xml; hence XPaths can be used to set expectations:

| Table: Rest Fixture |http://${jettyHost}:${jettyPort}|
|GET    | /resources/0 | 200 | Content-Type : application/xml;.+ |!-
 /resource/name[text()='a funky name'] <br/>
 /resource/data[text()='an important message']
-!|

Bespoke mapping can be defined in the config using the config key '''restfixture.content.handlers.map'''

| Table: Rest Fixture Config  | overridesContentHandlerConfig |
| restfixture.content.handlers.map | !-
application/xml=TEXT
-!|

| Table: Rest Fixture |http://${jettyHost}:${jettyPort}| overridesContentHandlerConfig |
|GET    | /resources/0 | 200 | Content-Type : application/xml;.+ |<resource>[\s.]*<name>a funky name</name>[\s\w\d<>/=\:'.]*</resource>[\s]*|

