title: Can I use Unicode characters in HTTP headers?
body: <p>Is HTTP headers limited to US-ASCII charset?</p>
  
  <p>Can I use unicode characters in HTTP headers?</p>
  
  <p><strong>Edit</strong>:</p>
  
  <p>I want to do like this:</p>
  
  <pre><code>WebClient myWebClient = new WebClient();
  myWebClient.Headers.Add("Content-Type","یونیکد");
  </code></pre>