How to force WebRequest to send Authorization header during POST
When using WebRequest to send a POST, the Authorization header is not sent with the request even though I have manually set the header and set PreAuthenticate to true, eg: webRequest.Headers["Authorization"] = "OAuth oauth_consumer_key=bFPD..."; webRequest.PreAuthenticate = true; Using Fiddler I can see that the Authorization header is not sent. The target site (Twitter) returns a 400 (Bad request) rather than a 401 (Not authorized) which is therefore the incorrect challenge required for WebRequest to send the Authorization data. For information, the returned content is: {"errors":[{"message":