Hello, on 09/19/2006 02:38 PM Joshua Slive said the following: > On 9/19/06, Manuel Lemos <mlemos@xxxxxxx> wrote: >> So, my doubt is: how can I configure Apache to return a response that >> may trigger chunking/compression or not that mod_gzip/mod_deflate >> performs ? >> >> I though of returning a custom header like "x-dechunk: no" from the PHP >> script response. But how can I configure Apache with >> mod_gzip/mod_deflate to not compress responses when that header is >> returned by a PHP script? > > It's easy enough to turn on or off deflate per-request using the > no-gzip environment variable. But unfortunately, I don't think there > is any way to set an environment variable based on a response header. > This is because env variables need to be set early in order to be > useful for content handlers. So they are set too early to look at > response headers. > > One option would be to have your php script do an internal redirect to > a non-deflated page. Another option would be to deflate everything, > but pad small response segments up to DeflateBufferSize. (The padding > should be mostly compressed away anyway.) Looking closer at the problem, I realized that mod_deflate does not dechunk gzip compressed responses, like mod_gzip does. So, for the purpose of flushing HTML blocks with Javascript sections, that is fine, although I wonder if the overhead of compress small blocks still pays the bandwidth/throughput benefits. Maybe it does. Now I wonder if there is a way to force dechunking Apache 2 responses. OTOH, mod_gzip allows turning off compression (and its dechunking) dynamically with configuration line like thos: mod_gzip_item_exclude rspheader "X-do-not-compress-this: yes" So, when my PHP scripts issue the header X-do-not-compress-this, mod_gzip does not compress the response nor dechunks it. Dechunking by mod_gzip is turned on by the mod_gzip_dechunk configuration option . There seems to not exist an option to do that dynamically. I wonder if there is a way to turn off dechunking with setenvif . -- Regards, Manuel Lemos Metastorage - Data object relational mapping layer generator http://www.metastorage.net/ PHP Classes - Free ready to use OOP components written in PHP http://www.phpclasses.org/ --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx
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