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URL Redirection

Module: mod_redirect

Description

The redirect module is used to specify redirects for a set of URLs.

Options

url.redirect

Redirects a set of URLs externally

url.redirect = ( "^/show/([0-9]+)/([0-9]+)$" => "http://www.example.org/show.php?isdn=$1&page$2",
                 "^/get/([0-9]+)/([0-9]+)$"  => "http://www.example.org/get.php?isdn=$1&page$2" )

# make an external redirect from any www.host (with www.) to the host (without www.)
$HTTP["host"] =~ "^www\.(.*)$" {
    url.redirect = ("" => "https://%1${url.path}${qsa}")
}

(more detailed documentation can be found in the Regular Expression section of mod_rewrite doc)

Note that the "%1" in the url.redirect target refers to the parenthesized subexpression in the conditional regexp (.*) directly enclosing the url.redirect. It does not have the meaning that "%1" would have in evhost.path-pattern (where it would mean 'top-level domain'). If url.redirect is specified within a regex conditional (=~), % patterns are replaced by the corresponding groups from the condition regex. %1 is replaced with the first subexpression, %2 with the second, etc. %0 is replaced by the entire substring matching the regexp. See above and below for examples using % patterns. A negative match (!~) does not save any % patterns.

Redirect rules are evaluated up until the first matched redirect rule. As a special case to allow short-circuiting the redirect rules without triggering a redirect, specify a blank target: url.redirect = ( "^/do-not-redirect/this/path" => "" ). Then, a further catch-all redirect rule might redirect everything else. This can be used as an alternative to nested conditions inside other conditions. The blank target special-case is available in version 1.4.40 or later.

url.redirect-code

Defines the HTTP status code that is sent with the redirect URL.
e.g. url.redirect-code = 302 (since 1.4.31)

Example

Some people love the www part in the url. A general solution to move all non www. hosts to its www equivalent: ::

$HTTP["host"] !~ "^www\." {
    url.redirect = ("" => "https://www.${url.authority}${url.path}${qsa}")
}

Moving all subdomains except a few to www.example.org:

$HTTP["host"] !~ "^(www|mail|mysql)\.example\.org$" {
    url.redirect = ("" => "https://www.example.org${url.path}${qsa}")
} 

Redirecting any HTTP request to HTTPS aka forcing SSL: HowToRedirectHttpToHttps

(more detailed documentation can be found in the Regular Expression section of mod_rewrite doc)

Updated by gstrauss about 1 month ago · 31 revisions