title: How to get client ip address in HttpHandler (Julia Language)?
body: <p>I need to get client's IP address in regular HttpHandler like this:</p>
  
  <pre><code>http = HttpHandler() do req::Request, res::Response
      Response( ismatch(r"^/hello/",req.resource) ? string("Hello ", split(req.resource,'/')[3], "!") : 404 )
  end
  </code></pre>
  
  <p>Neither <code>req</code> nor <code>http.sock</code> contain this information.</p>