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Matteo Riva
Asked: 2011-07-08 00:06:59 +0800 CST

Apache deflates .xml.gz files

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I noticed an error in google webmaster tools regarding a gzipped version of a sitemap. Turns out the sitemap.xml.gz file is gzipped twice: one upon creation (as it should be) and another time when being served.

The .htaccess file has this rule

AddOutputFilterByType DEFLATE application/xml

which I thought wouldn't match a gzipped XML file, but apparently it does as removing this solves the problem.

What am I doing wrong?

apache-2.2 .htaccess compression gzip mod-deflate

1 Answers

  1. Best Answer

    The .xml.gz filetype may be defined as being an xml file (e.g. with forcetype in a filesmatch block) - which would cause Apache to match it to the type above.

    I think you can get around that by adding an exception, above it:

    SetEnvIfNoCase Request_URI ".xml.gz$" no-gzip dont-vary

    You might want to see HowToForge for more exceptions to add.

    Hope it works for you.

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