title: Guzzle get file and forward it
body: <p>I have a web-service that gets a file and returns it to the user (based on Symfony). 
  Ever since I used curl to do this. </p>
  
  <p>I just found guzzlehttp and it seems great. However, I do not know how to do this with guzzle without saving the downloaded file (xml or txt) to a local file, read it from the file system a returning it to the user. I want to do this without saving to the file system.</p>