Which browsers handle `Content-Encoding: gzip` and which of them has any special requirements on encodinq quality?

Question

I am creating a "hand made" HTTP 1/0, 1/1 server. I recently integrated zip lib so now I can stream encoded gziped data in and out. I wonder Which major browsers (alive ones - IE6-IE10, Chrome, FF, etc) send Accept-Encoding: deflate, gzip, ... and so can handle Content-Encoding: gzip today? Which of them send any quality expectations? Which of them can send encoded gziped post request and multypart/form data to my server?

Answer 1

Basically every browser nowadays supports deflate/gzip. This page lists many browsers and version numbers. Here's a summary plus some newer browsers:

• Netscape 6+ (Netscape 4-5 does, but with some bugs).
• Internet Explorer 5.5+ (July 2000) and IE 4 if set to HTTP/1.1.
• Opera 5+ (June 200)
• Lynx 2.6+ (some time before 1999)
• Firefox 0.9.5+ (October 2001)
• Chrome since forever
• Safari since forever (as far as I can tell)

As you can see: for almost 10 years, there's full support, and (almost) nobody uses a more than 10 year old browser.