Special Environment that can be used in rewrite rule to control features 

dontlog
skip access logging once set, value does not matter, example: 
RewriteRule \.gif - [E=dontlog:1]

nokeepalive
Close client connection after finish this request, value does not matter, example: 
RewriteRule .* - [E=nokeepalive:1]

no-gzip
Do not use gzip compression for this request, must be none-zero to set, example 
RewriteRule \.css - [E=no-gzip:1]

no-gzip:0 has no effect.

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


cache-ctrl/cache-control
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 process from being killed by lsws as a runaway process while it is in the middle of processing. 
RewriteRule  ^script_url$ - [E=noabort:1]

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