Mod rewrite » History » Revision 37
Revision 36 (soenke, 2008-06-23 15:15) → Revision 37/64 (dandv, 2008-07-14 05:34)
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#!rst
============
URL Rewrites
============
-------------------
Module: mod_rewrite
-------------------
.. meta::
:keywords: lighttpd, rewrite
.. contents:: Table of Contents
Description
===========
internal redirects, url rewrite
Options
=======
url.rewrite-once
rewrites a set of URLs internally in the webserver BEFORE they are handled.
e.g. ::
url.rewrite-once = ( "<regex>" => "<relative-uri>" )
url.rewrite-repeat
rewrites a set of URLs internally in the webserver BEFORE they are handled
e.g. ::
url.rewrite-repeat = ( "<regex>" => "<relative-uri>" )
The difference between these options is that, while url.rewrite-repeat allows for applying multiple (seperately defined) rewrite rules in a row, url.rewrite-once will cause further rewrite rules to be skipped if the expression was matched. As such, url.rewrite-once behaves like Apaches' RewriteRule ... [L]: http://httpd.apache.org/docs/2.2/mod/mod_rewrite.html#rewriterule
The options ``url.rewrite`` and ``url.rewrite-final`` were mapped to ``url.rewrite-once``
in 1.3.16.
NOTE: url rewriting does not work within a $HTTP["url"] conditional. [http://forum.lighttpd.net/topic/1092#3028]
Regular Expressions
===================
* Patterns ("wildcards") are matched against a string
* Special characters (see [http://www.regular-expressions.info/reference.html] for reference): characters:
* . (full stop) - match any character
* \* (asterisk) - match zero or more of the previous symbol
* \+ (plus) - match one or more of the previous symbol
* ? (question) - match zero or one of the previous symbol
* \\? (backslash-something) - match special characters
* ^ (caret) - match the start of a string
* $ (dollar) - match the end of a string
* [set] - match any one of the symbols inside the square braces.
* (pattern) - grouping, remember what the pattern matched as a special variable
* {n,m} - from n to m times matching the previous character (m could be omitted ommited to mean >=n times)
* (?!expression) - match anything BUT expression at the current position. Example: ``"^/((?:(favicon.ico$|js/|images/).*)" => "/fgci/$1"``
* Normal alphanumeric characters are treated as normal
Replacement Patterns
--------------------
If the matched regex contains groups in parentheses, $1..$9 in the replacement refer to the captured text in the
matching group "$1" meaning the first group, "$2" the second, and so on.
You can also use certain meta-patterns in replacement text (NOTE: these inferred from examples in other modules, but unverified yet.):
* %% => % sign
* %0 => domain name + tld (Top Level Domain, like .com or .net)
* %1 => tld
* %2 => domain name without tld
* %3 => subdomain 1 name
* %4 => subdomain 2 name
Examples
========
The regex is matching the full REQUEST_URI which is supplied by the user including
query-string.::
url.rewrite-once = ( "^/id/([0-9]+)$" => "/index.php?id=$1",
"^/link/([a-zA-Z]+)" => "/index.php?link=$1" )
# the following example, is, however just simulating vhost by rewrite
# * you can never change document-root by mod_rewrite
# use mod_*host instead to make real mass-vhost
# request: http://any.domain.com/url/
# before rewrite: REQUEST_URI="/www/htdocs/url/"
# and DOCUMENT_ROOT="/www/htdocs/" %0="any.domain.com" $1="url/"
# after rewrite: REQUEST_URI="/www/htdocs/any.domain.com/url/"
# still, you have DOCUMENT_ROOT=/www/htdocs/
server.document-root = "/www/htdocs/"
$HTTP["host"] =~ "^.*\.([^.]+\.com)$" {
url.rewrite-once = ( "^/(.*)" => "/%0/$1" )
}
# please note, that we have two regular expressions: the one which
# $HTTP["host"] is been compared with, and the one of the rewrite rule.
# the numbered subexpressions available to build the relative uri are
# being prefixed by '%' for subexpressions of the first regular expression
# match and by '$' for subexpressions of the second one.
# in the case, when the rewrite rule is not included in a conditional
# block, only the '$' prefixed variables are available.
# subexpression 0 is the whole matching expression.
With mod_redirect
-----------------
Rewrite rules always execute before redirect rules. This is true regardless of the order of module loading or the order of rules in the configuration (lighttpd v1.4.13). However, mod_rewrite provides a mechanism to pass URLs through unmangled: specify "$0" as the rule target.
e.g. ::
url.rewrite-once = (
"^/foo" => "$0",
"^/(.*)" => "/handler/$1"
)
url.redirect = (
"^/foo" => "http://foo.bar/"
)
Workaround for "File name too long" on Windows
----------------------------------------------
While running Lighttpd on Windows you may get ``500 Internal Server Error`` if computed filename is longer than 255 symbols.
In error log it will be ``(response.c.537) file not found ... or so: File name too long /very_looooong_path ->``.
As workaround you can use ``mod_rewrite`` to avoid this error.
::
server.modules += ("mod_rewrite")
url.rewrite-once = ( ".{250,}" => "/toolong.php" )
If error handler is PHP, ``$_SERVER['REQUEST_URI']`` will contain full URI.
Passing / Matching the Query string (GET variables)
---------------------------------------------------
If you wanna pass the Query String (?foo=bar) to the rewrite destination you have to explicitly match it:
::
url.rewrite-once = (
"^/news/([^\?]+)(\?(.*))?" => "/news.php?title=$1&$3"
)
}}}