title: Browser support of multipart responses
body: <p>I would like to create a HTTP response, using multipart/mixed, but I'm not sure which browsers support it; and if it's as convenient as it sounds, from the client's point of view.
  To be honest, I do not need specifically that content type. I just want to transmit more than one file in the same response; maybe there's another content-type more used.</p>