title: python get uploaded file stream (multipart/form-data)
body: <p>I'm currently trying to figure out how to get the stream of an uploaded file.<br/>
  I want to receive the file live and send it to a seperate file server. Python receive files like PHP, doesn't it?<br/> I get the temp-name and copy the file out of the temp-directory. But that would be very slow, to first receive the whole file and then reupload it to the external server.
  Is it possible to get the stream,while the client is writing, and then send the data to the external server?</p>