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If your decision about compression depends on other information than request headers e. This prevents compliant proxies from caching entirely. This may be accomplished using a configuration like the following:. The DeflateBufferSize directive specifies the size in bytes of the fragments that zlib should compress at one time. If the compressed response size is bigger than the one specified by this directive then httpd will switch to chunked encoding HTTP header Transfer-Encoding set to Chunked , with the side effect of not setting any Content-Length HTTP header.
The DeflateCompressionLevel directive specifies what level of compression should be used, the higher the value, the better the compression, but the more CPU time is required to achieve this. The DeflateFilterNote directive specifies that a note about compression ratios should be attached to the request.
The name of the note is the value specified for the directive. You can use that note for statistical purposes by adding the value to your access log. If you want to extract more accurate values from your logs, you can use the type argument to specify the type of data left as a note for logging. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Ask Question. Asked 10 years, 7 months ago. Active 7 years, 1 month ago. Viewed 31k times. Sarah Ogbonna Sarah Ogbonna 2 2 gold badges 2 2 silver badges 14 14 bronze badges. At this stage you can choose to load our deflate rule set for all sites or per vhost. To load the rule set it for all sites place this line in httpd.
If you just want to use these rules for one website put this command in the body of that individual vhost in the "httpd-vhost. Finally we save our changes and restart apache httpd. For Slackware folks here is the restart command for apache. In my previous deflate file we compressed everything except a list of excluded types.
An alternative approach is to only compress for named types for example html, css, js. Here is a deflate rule set I have used this approach. You can try it for yourself compressing a png or a jpeg with WinZip or WinRar, or 7zip
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