title: Creating very custom AJAX request
body: <p>I'm pretty new to javascript-web interaction, so any wide advice would be helpful.</p>
  
  <p>Example of what I need:</p>
  
  <pre><code>POST Join HTTP/1.1
  Host: my.host
  Content-Type: myContentType
  
  [message body]
  </code></pre>
  
  <p>Trying to do that with AJAX and see result in Charles web proxy. The result is not that good, since ajax adds so many fields that I don't require and don't gives me access to set Content-Type by hand (or at least I haven't found the way).</p>
  
  <p>Server is very sensitive to all symbols in header, so I think I need a very smart way to construct those requests by hand (?) or with a really tuneable system. Maybe anyone could help me on this.</p>