WebAPI IHttpActionResult vs HttpResponseMessage

The WebAPI Controller can return either HttpResponseMessage or IHttpActionResult. HttpResposeMessage converts it directly to an HTTP response message. Call ExecuteAsync to create an HttpResponseMessage then convert to an HTTP response message.

ApiController Action Result Methods by HTTP Status Code

Status Code	Meaning	Method
200	Operation successful	Ok() Ok(data)
302	Temporary Redirection	Redirect(target) RedirectToRoute(name, props)
400	Bad Request	BadRequest() BadRequest(message) BadRequest(model)
404	Not Found	NotFound()
409	Conflict	Conflict()
500	Internal Server Error	InternalServerError() InternalServerError(Exception)

Technorati Tags: WebAPI