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From "Joshua Slive" <jos...@slive.ca>
Subject Re: [users@httpd] Content-Length for HEAD when using compression?
Date Fri, 15 Feb 2008 23:20:24 GMT
On Fri, Feb 15, 2008 at 5:42 PM, Michael McGlothlin
<michaelm@swplumb.com> wrote:
>
>  >> 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.

What does this have to do with reloading? Browsers use GET with
If-Modified-Since to check cache freshness, not HEAD.

Joshua.

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