Tuesday, June 15, 2010

Beware of YSlow and GZip

Much time can be wasted trying to configure mod_deflate IF it is already properly configured.  Although I had previously enabled compression using this simple and powerful Apache module, YSlow was giving me an F for not compressing the page text as well as js and css files.  To make a short story even shorter I will simply say this: 

YSlow does not accurately detect gzip compression.  If you are uncertain, check the response headers for "Vary: Accept Encoding" or use Port80's Compression Check.

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