Special environment variables in LiteSpeed Rewrite Rules

The following are the special environment variables that can be used in rewrite rules to control features:

Once set, skips access logging. The value does not matter, for example:
RewriteRule \.gif - [E=dontlog:1]

Closes the client's connection after finishing this request. The value does not matter, for example:
RewriteRule .* - [E=nokeepalive:1]

Do not use gzip compression for this request, must be set to a non-zero value, for example:
RewriteRule \.css - [E=no-gzip:1]
no-gzip:0 has no effect.

Modify proxy request "Host" header value, for example:
A web site's domain name is "www.example.com". It sends a proxy request to the backend. The backend is defined as a web server with the name "node1",  and it requires the domain name to be "www.example.com". The rewrite rule should be
RewriteRule ^(.*)$ http://node1/$1 [P,E=Proxy-Host:www.example.com]

Modify LSWS page cache policy
enable cache
Rewriterule ^/special_cachable_url$ - [E=Cache-ctrl:max-ages=30]
Rewriterule ^/non-cacheable-url$ - [E=Cache-control:no-cache]

No abort
This flag prevents external app processes from being killed by LSWS as a runaway process while it is in the middle of processing.
RewriteRule ^script_url$ - [E=noabort:1]

  • Variables, Rewrite Rules
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