title: HTML form cannot post file content
body: <p>I'd like to post file to server by html form below:</p>
  
  <pre><code>&lt;form action="http://localhost:8000/upload/file=1.txt" enctype="multipart/form-data" method="post"&gt;
      &lt;input type="file"&gt;
      &lt;input type="submit" value="Send"&gt;
  &lt;/form&gt;
  </code></pre>
  
  <p>And the HTTP header is below after click button "Send":</p>
  
  <p><strong>Response Headers</strong></p>
  
  <ul>
  <li>HTTP/1.0 200 OK</li>
  <li>Date: Tue, 11 Aug 2015 08:35:28 GMT</li>
  <li>Server: WSGIServer/0.2 CPython/3.4.3</li>
  <li>X-Frame-Options: SAMEORIGIN</li>
  <li>Content-Type: text/html; charset=utf-8</li>
  </ul>
  
  <p><strong>Request Headers</strong></p>
  
  <ul>
  <li>POST /upload/file=1.txt HTTP/1.1</li>
  <li>Host: localhost:8000</li>
  <li>User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:39.0)
  Gecko/20100101 Firefox/39.0</li>
  <li>Accept:
  text/html,application/xhtml+xml,application/xml;q=0.9,<em>/</em>;q=0.8</li>
  <li>Accept-Language: de</li>
  <li>Accept-Encoding: gzip, deflate</li>
  <li>Referer: <a href="http://localhost:8083/" rel="nofollow">http://localhost:8083/</a></li>
  <li>Connection: keep-alive</li>
  </ul>
  
  <p><strong>Request Headers From Upload Stream</strong></p>
  
  <ul>
  <li>Content-Length   48</li>
  <li>Content-Type multipart/form-data;
  boundary=---------------------------121841334829646</li>
  </ul>
  
  <p>But it seems the file content can never be posted. Only the "-----------------------------121841334829646--" be posted to server. How can the file content be posted to server by html form?</p>
  
  <p>Thanks!</p>