title: Could not modify reason phrase on HttpResponse object in asp vNext
body: <p>I have to set the reason phrase in my asp 5 middle-ware, not just the status code for the http response messages, but I could not found any way to do it.
  The <code>StatusCode</code> property of the <code>Microsoft.AspNet.Http.HttpResponse</code> class is an <code>int</code> property for modifying the status code only, but not the reason text.</p>
  <p>I understand, that the reason is set automatically according to the status code, but in my case I have to set it to custom values. Which is OK according to the <a href="https://www.rfc-editor.org/rfc/rfc2616#section-6.1.1" rel="nofollow noreferrer">HTTP RFC 2616</a>:</p>
  <blockquote>
  <p>[..] The reason phrases listed here are only recommendations -- they MAY be replaced by local equivalents without affecting the protocol. [..]</p>
  </blockquote>
  <p>I'm currently using <strong>beta-8</strong> version of the asp 5 framework.</p>