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Just a quick update that I thought might be useful: I've just installed Page Speed 1.8.2 and the issues I reported earlier have disappeared! (So it was a problem with Page Speed, not LiteSpeed! :cool: )

Firebug 1.5.4 with Page Speed 1.8... I'm beginning to suspect the problem lies with Page Speed, since "Specify a Vary: Accept-Encoding header" is listed as a new rule/new feature on http://code.google.com/p/page-speed/wiki/ReleaseNotes and maybe there are a few buglets left... :p

The URL is: http://www.tafeltennis.org/ Firebug Net shows the following headers: Content-Encoding gzip Vary Accept-Encoding Date Mon, 24 May 2010 11:33:42 GMT Accept-Ranges bytes Etag "1a7a-4bee99ba-f20186" Last-Modified Sat, 15 May 2010 12:55:22 GMT Content-Type...

Ah, now I see what you mean! ;) Actually, it is Page Speed that tells me to add the header --and I guess that's technically a Firebug plug-in/add-on, rather than part of FB proper... But once you have it installed, it "behaves" just like FB!

See also: http://getfirebug.com/network

This is what I do: 1) Make sure that "Net" is enabled (click on the little arrow for a drop-down menu if necessary) 2) Load a page, asking Firebug to show "All" 3) Click on the "+" sign in front of an element for details on that element, including headers and caching information!

P.S.: I just checked the headers with another tool, which tells me that Vary: Accept-Encoding is being sent twice, so it looks like the header was already being sent --perhaps it is an issue with Firebug, then?!? :confused:

Thanks, that seems to have done the trick; i.e., when I check the server headers, I now see "Vary: Accept-Encoding" --however, Firebug still advises me to add the header to two resources (the HTML page itself and the CSS in an external file, but not the images on the page)... Do I need to take...

OK, so does that mean I should manually edit a particular file (rather than use the admin console)? If so, which file (and in which directory)? TIA for your help!

One of the recommendations I get from Firebug for improving the overall performance of my sites is to specify a Vary: Accept-Encoding header. I've been looking in the online documentation and got the impression that this should be done in Context > Extra Headers, however... I am unable to...