* Set the base URL of REST resource * @param {String} url - base URL

* Set default headers for every method of the RESTClient * @param {Object} headers - deafult headers in a key-value pair

* Set custom headers for a REST method * @param {Object} headersDef - custom headers in a key-value pair

* Defines the media type(s) that the methods can produce * @param MediaType producesDef - mediaType to be parsed