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Nelson Minar
Blog licensed under a Creative Commons License
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Today I learned that Internet Explorer isn't caching any images from my blog
at all. Why? A
nasty
bug in MSIE that
mod_gzip
triggers. Gory details and a partial fix below.
The issue is that mod_gzip includes the following header in all responses:
Vary: Accept-Encoding
This helps prevent caches from serving gzip data to browsers that
can't support it.
Unfortunately it also triggers a bug in MSIE - the browser won't cache any document with that header! So with mod_gzip 95% of the world's browsers won't cache any pages from the server. Some bandwidth savings. It'd be nice if mod_gzip was smart enough not to add the Vary: header if it didn't compress the file, but it's not. A partial workaround is to turn mod_gzip off for files it won't be compressing anyway, like images.
<FilesMatch "\.(gif|jpe?g|png)$">
This fix is only partial; other files (say, HTML) still won't be
cached. Three choices - stop using gzip, lose caching in IE,
or drop the Vary: header and break caches.
mod_gzip_on No </FilesMatch> |
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