Apache mod_rewrite

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``The great thing about mod_rewrite is it gives you + all the configurability and flexibility of Sendmail. + The downside to mod_rewrite is that it gives you all + the configurability and flexibility of Sendmail.''
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-- Brian Behlendorf
+ Apache Group
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`` Despite the tons of examples and docs, + mod_rewrite is voodoo. Damned cool voodoo, but still + voodoo. ''
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-- Brian Moore
+ bem@news.cmc.net
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Welcome to mod_rewrite, the Swiss Army Knife of URL + manipulation!

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This module uses a rule-based rewriting engine (based on a + regular-expression parser) to rewrite requested URLs on the + fly. It supports an unlimited number of rules and an + unlimited number of attached rule conditions for each rule to + provide a really flexible and powerful URL manipulation + mechanism. The URL manipulations can depend on various tests, + for instance server variables, environment variables, HTTP + headers, time stamps and even external database lookups in + various formats can be used to achieve granular URL + matching.

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This module operates on the full URLs (including the + path-info part) both in per-server context + (httpd.conf) and per-directory context + (.htaccess) and can even generate query-string + parts on result. The rewritten result can lead to internal + sub-processing, external request redirection or even to an + internal proxy throughput.

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But all this functionality and flexibility has its + drawback: complexity. So don't expect to understand this + entire module in just one day.

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Documentation
mod_rewrite

Documentation

mod_rewrite

Extensive documentation on the directives +provided by this module is provided in the mod_rewrite reference documentation. +