title: How to set Accept and Accept-Language header fields?
body: <p>I can set Request.Content-Type = ... , Request.Content-Length = ...</p>
  
  <p>How to set Accept and Accept-Language?</p>
  
  <p>I want to upload a file (RFC 1867) and need to create a request like this:</p>
  
  <pre>
  POST /test-upload.php.xml HTTP/1.1
  Host: example.com
  User-Agent: Mozilla/5.0 (Windows NT 5.2; WOW64; rv:2.0.1) Gecko/20100101 Firefox/4.0.1
  Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
  Accept-Language: tr-tr,tr;q=0.8,en-us;q=0.5,en;q=0.3
  Accept-Encoding: gzip, deflate
  Accept-Charset: ISO-8859-9,utf-8;q=0.7,*;q=0.7
  Keep-Alive: 115
  Connection: keep-alive
  Content-Type: multipart/form-data; boundary=---------------------------21724139663430
  Content-Length: 56048
  </pre>