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From Michael McGlothlin <>
Subject Re: [users@httpd] Content-Length for HEAD when using compression?
Date Fri, 15 Feb 2008 22:42:41 GMT

>> I'm using PHP to dynamically serve images and am using compression on
>>  the output. For GET I know that I should make the Content-Length header
>>  the size of the compressed data. For HEAD requests do I do the same or
>>  do I provide the uncompressed Content-Length? Thanks.
> HEAD responses should be identical to GET responses without the content body.
That's what I thought but when testing if I supply a Content-Length (of 
any kind) then reloads take considerably longer (~6x as long) as if I 
don't specify any Content-Length header. I'd expect better page reload 
times if all images had their size defined. Not sure why it'd be so much 
slower with more precise information in the headers.

Michael McGlothlin
Southwest Plumbing Supply

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