Unknown error HttpException

Continue SwitchingProtocols OK Created Accepted NonAuthoritativeInformation NoContent ResetContent PartialContent MultipleChoices Ambiguous MovedPermanently Moved Found Redirect SeeOther RedirectMethod NotModified UseProxy Unused TemporaryRedirect RedirectKeepVerb BadRequest Unauthorized PaymentRequired Forbidden NotFound MethodNotAllowed NotAcceptable ProxyAuthenticationRequired RequestTimeout Conflict Gone LengthRequired PreconditionFailed RequestEntityTooLarge RequestUriTooLong UnsupportedMediaType RequestedRangeNotSatisfiable ExpectationFailed UpgradeRequired InternalServerError NotImplemented BadGateway ServiceUnavailable GatewayTimeout HttpVersionNotSupported