Response.ContentType doesn't work in MVC controller

[Eilon]

From @Daniel15 in aspnet/HttpAbstractions#364:

I'm using Razor to generate some XML (an RSS feed). I have this in one of my ASP.NET MVC controllers:

Response.ContentType = "application/rss+xml";
return View("Foo")

However IIS Express is still serving the response as text/html.

This doesn't work either:

Response.Headers.Set("Content-Type", "application/rss+xml");

However, setting a custom header (eg. X-Test) does work.

(I wasn't sure whether to report this here or in the ASP.NET MVC repo)

[Eilon]

From me:

We should have the view engine only set the content type if it's not already set. According to @Tratcher this is trivial to do.