Returns the next response from the queue built by addResponse()
Only responses without explicit URLs or with URLs equal to request URL will be considered. If matching response is not found or the queue is empty then default empty response with status 400 will be returned, if an Exception object was added to the queue it will be thrown.
Overrides
HTTP_Request2_Adapter::sendRequest() (Sends request to the remote server and returns its response)
Parameters: