Summary: Mock requests can currently only return an HTTP Status Code of 200. This is not sufficient to take full advantage of the mocking feature. It would be more useful to specify a status code for the response. Then not only can the original request be tested, but failure of the call could be tested as well. This is described in Issue https://github.com/facebook/flipper/issues/1423 [https://github.com/facebook/flipper/issues/1423] Changelog: Allow user to change response code for a mock request Pull Request resolved: https://github.com/facebook/flipper/pull/1441 Test Plan: Here is a video demonstrating the change [Uploading response-status-code.mp4.zip…] Here is a screenshot showing where the new HTTP status code is entered for the mock request:  This screenshot shows a mock response with an alternate return code:  Reviewed By: jknoxville Differential Revision: D22977811 Pulled By: passy fbshipit-source-id: c1662dd02abeb4546c80a416ed87f8e0dadbf96a