code: function(sName, sXHRMethod, fnCallback) {
  			Log.debug("Register '" + sName + "' for XHR function '" + sXHRMethod + "'", XHRINTERCEPTOR);
  
  			// initially the override needs to be placed per XHR method
  			if (!mRegistry[sXHRMethod]) {
  				createOverride(sXHRMethod);
  			}
  			mRegistry[sXHRMethod][sName] = fnCallback;
  		}
docs: Register a function callback which gets called as it would be an own method of XHR.
  
  @param {string} sName Name under which the function is registered
  @param {string} sXHRMethod Name of the actual XHR method
  @param {function} fnCallback The registered callback function
  @public