title: webapi2 return simple string without quotation mark
body: <p>Simple scenario:</p>
  
  <pre><code>public IHttpActionResult Get()
  {
      return Ok&lt;string&gt;("I am send by HTTP resonse");
  }
  </code></pre>
  
  <p>returns:</p>
  
  <pre><code>"I am send by HTTP resonse"
  </code></pre>
  
  <p>Just curious, can I avoid the quotation mark in other words return:</p>
  
  <pre><code>I am send by HTTP resonse
  </code></pre>
  
  <p>or is this necessary in HTTP?</p>