Because of general incompetence and lack of testing, several sites fail to ensure they compress (either gzip or deflate) the content they send for some browsers but not others; sometimes sites deliberately target browsers for such treatment. This online test checks using a variety of different user-agent strings whether compression browser discrimination occurs. It will follow HTTP redirects, but not meta redirects so that is something to be aware of. Opera users can use this button to easily test a site (drag it up to a toolbar of your choice): GZip-Test