Apache mod_rewrite使用PATH_INFO派生额外的重写子请求

假设我想将所有以

/test/

开头的请求路由到一个PHP文件

info.PHP

。我可以通过将原始的

%{REQUEST_URI}

传递为：

查询字符串参数，如中所示

info.php?request_uri=/test/some/path

或，

PATH\u INFO

-紧跟在

INFO.php

后面的路径字符串，如

info.php/test/some/path

还有其他方法（例如环境变量），但我的问题是关于使用

PATH\u INFO

时的奇怪行为

问题在于，根据重写日志，

PATH\u INFO

方法比查询字符串方法多生成一个子请求

有人能解释为什么会这样吗

细节

DOCUMENT\u ROOT

位于

/var/www

。httpd-V的第一行是：

Server version: Apache/2.2.15 (Unix)

路径信息

/var/www/test/.htaccess

文件的内容如下：

DirectoryIndex disabled
DirectorySlash off
Options +FollowSymLinks -MultiViews

RewriteEngine on

# Only perform the rewrite for first round of mod_rewrite processing.
RewriteCond %{ENV:REDIRECT_STATUS} =""
# Pass current path as PATH_INFO to PHP script.
RewriteRule ^ info.php%{REQUEST_URI}

对

/test/some/path

的请求产生以下重写日志输出：

127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b5d888/initial] (3) [perdir /var/www/test/] add path info postfix: /var/www/test/some -> /var/www/test/some/path
127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b5d888/initial] (3) [perdir /var/www/test/] strip per-dir prefix: /var/www/test/some/path -> some/path
127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b5d888/initial] (3) [perdir /var/www/test/] applying pattern '^' to uri 'some/path'
127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b5d888/initial] (4) [perdir /var/www/test/] RewriteCond: input='' pattern='=' => matched
127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b5d888/initial] (2) [perdir /var/www/test/] rewrite 'some/path' -> 'info.php/test/some/path'
127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b5d888/initial] (3) [perdir /var/www/test/] add per-dir prefix: info.php/test/some/path -> /var/www/test/info.php/test/some/path
127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b5d888/initial] (2) [perdir /var/www/test/] strip document_root prefix: /var/www/test/info.php/test/some/path -> /test/info.php/test/some/path
127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b5d888/initial] (1) [perdir /var/www/test/] internal redirect with /test/info.php/test/some/path [INTERNAL REDIRECT]
127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b54fd0/initial/redir#1] (3) [perdir /var/www/test/] add path info postfix: /var/www/test/info.php -> /var/www/test/info.php/test/some/path
127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b54fd0/initial/redir#1] (3) [perdir /var/www/test/] strip per-dir prefix: /var/www/test/info.php/test/some/path -> info.php/test/some/path
127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b54fd0/initial/redir#1] (3) [perdir /var/www/test/] applying pattern '^' to uri 'info.php/test/some/path'
127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b54fd0/initial/redir#1] (4) [perdir /var/www/test/] RewriteCond: input='200' pattern='=' => not-matched
127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b54fd0/initial/redir#1] (1) [perdir /var/www/test/] pass through /var/www/test/info.php

(The subrequest begins here)

127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b4d818/subreq] (3) [perdir /var/www/test/] add path info postfix: /var/www/test/some -> /var/www/test/some/path
127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b4d818/subreq] (3) [perdir /var/www/test/] strip per-dir prefix: /var/www/test/some/path -> some/path
127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b4d818/subreq] (3) [perdir /var/www/test/] applying pattern '^' to uri 'some/path'
127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b4d818/subreq] (4) [perdir /var/www/test/] RewriteCond: input='200' pattern='=' => not-matched
127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b4d818/subreq] (1) [perdir /var/www/test/] pass through /var/www/test/some

127.0.0.1 - - [02/Feb/2015:19:49:07 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b56858/initial] (3) [perdir /var/www/test/] add path info postfix: /var/www/test/some -> /var/www/test/some/path
127.0.0.1 - - [02/Feb/2015:19:49:07 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b56858/initial] (3) [perdir /var/www/test/] strip per-dir prefix: /var/www/test/some/path -> some/path
127.0.0.1 - - [02/Feb/2015:19:49:07 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b56858/initial] (3) [perdir /var/www/test/] applying pattern '^' to uri 'some/path'
127.0.0.1 - - [02/Feb/2015:19:49:07 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b56858/initial] (4) [perdir /var/www/test/] RewriteCond: input='' pattern='=' => matched
127.0.0.1 - - [02/Feb/2015:19:49:07 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b56858/initial] (2) [perdir /var/www/test/] rewrite 'some/path' -> 'info.php?request_uri=/test/some/path'
127.0.0.1 - - [02/Feb/2015:19:49:07 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b56858/initial] (3) split uri=info.php?request_uri=/test/some/path -> uri=info.php, args=request_uri=/test/some/path
127.0.0.1 - - [02/Feb/2015:19:49:07 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b56858/initial] (3) [perdir /var/www/test/] add per-dir prefix: info.php -> /var/www/test/info.php
127.0.0.1 - - [02/Feb/2015:19:49:07 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b56858/initial] (2) [perdir /var/www/test/] strip document_root prefix: /var/www/test/info.php -> /test/info.php
127.0.0.1 - - [02/Feb/2015:19:49:07 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b56858/initial] (1) [perdir /var/www/test/] internal redirect with /test/info.php [INTERNAL REDIRECT]
127.0.0.1 - - [02/Feb/2015:19:49:07 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b54fe0/initial/redir#1] (3) [perdir /var/www/test/] strip per-dir prefix: /var/www/test/info.php -> info.php
127.0.0.1 - - [02/Feb/2015:19:49:07 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b54fe0/initial/redir#1] (3) [perdir /var/www/test/] applying pattern '^' to uri 'info.php'
127.0.0.1 - - [02/Feb/2015:19:49:07 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b54fe0/initial/redir#1] (4) [perdir /var/www/test/] RewriteCond: input='200' pattern='=' => not-matched
127.0.0.1 - - [02/Feb/2015:19:49:07 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b54fe0/initial/redir#1] (1) [perdir /var/www/test/] pass through /var/www/test/info.php

查询字符串

/var/www/test/.htaccess

的最后一行更改为：

RewriteRule ^ info.php?request_uri=%{REQUEST_URI}

对

/test/some/path

的请求产生以下重写日志输出：

127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b5d888/initial] (3) [perdir /var/www/test/] add path info postfix: /var/www/test/some -> /var/www/test/some/path
127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b5d888/initial] (3) [perdir /var/www/test/] strip per-dir prefix: /var/www/test/some/path -> some/path
127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b5d888/initial] (3) [perdir /var/www/test/] applying pattern '^' to uri 'some/path'
127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b5d888/initial] (4) [perdir /var/www/test/] RewriteCond: input='' pattern='=' => matched
127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b5d888/initial] (2) [perdir /var/www/test/] rewrite 'some/path' -> 'info.php/test/some/path'
127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b5d888/initial] (3) [perdir /var/www/test/] add per-dir prefix: info.php/test/some/path -> /var/www/test/info.php/test/some/path
127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b5d888/initial] (2) [perdir /var/www/test/] strip document_root prefix: /var/www/test/info.php/test/some/path -> /test/info.php/test/some/path
127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b5d888/initial] (1) [perdir /var/www/test/] internal redirect with /test/info.php/test/some/path [INTERNAL REDIRECT]
127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b54fd0/initial/redir#1] (3) [perdir /var/www/test/] add path info postfix: /var/www/test/info.php -> /var/www/test/info.php/test/some/path
127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b54fd0/initial/redir#1] (3) [perdir /var/www/test/] strip per-dir prefix: /var/www/test/info.php/test/some/path -> info.php/test/some/path
127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b54fd0/initial/redir#1] (3) [perdir /var/www/test/] applying pattern '^' to uri 'info.php/test/some/path'
127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b54fd0/initial/redir#1] (4) [perdir /var/www/test/] RewriteCond: input='200' pattern='=' => not-matched
127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b54fd0/initial/redir#1] (1) [perdir /var/www/test/] pass through /var/www/test/info.php

(The subrequest begins here)

127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b4d818/subreq] (3) [perdir /var/www/test/] add path info postfix: /var/www/test/some -> /var/www/test/some/path
127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b4d818/subreq] (3) [perdir /var/www/test/] strip per-dir prefix: /var/www/test/some/path -> some/path
127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b4d818/subreq] (3) [perdir /var/www/test/] applying pattern '^' to uri 'some/path'
127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b4d818/subreq] (4) [perdir /var/www/test/] RewriteCond: input='200' pattern='=' => not-matched
127.0.0.1 - - [02/Feb/2015:19:46:22 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b4d818/subreq] (1) [perdir /var/www/test/] pass through /var/www/test/some

127.0.0.1 - - [02/Feb/2015:19:49:07 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b56858/initial] (3) [perdir /var/www/test/] add path info postfix: /var/www/test/some -> /var/www/test/some/path
127.0.0.1 - - [02/Feb/2015:19:49:07 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b56858/initial] (3) [perdir /var/www/test/] strip per-dir prefix: /var/www/test/some/path -> some/path
127.0.0.1 - - [02/Feb/2015:19:49:07 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b56858/initial] (3) [perdir /var/www/test/] applying pattern '^' to uri 'some/path'
127.0.0.1 - - [02/Feb/2015:19:49:07 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b56858/initial] (4) [perdir /var/www/test/] RewriteCond: input='' pattern='=' => matched
127.0.0.1 - - [02/Feb/2015:19:49:07 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b56858/initial] (2) [perdir /var/www/test/] rewrite 'some/path' -> 'info.php?request_uri=/test/some/path'
127.0.0.1 - - [02/Feb/2015:19:49:07 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b56858/initial] (3) split uri=info.php?request_uri=/test/some/path -> uri=info.php, args=request_uri=/test/some/path
127.0.0.1 - - [02/Feb/2015:19:49:07 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b56858/initial] (3) [perdir /var/www/test/] add per-dir prefix: info.php -> /var/www/test/info.php
127.0.0.1 - - [02/Feb/2015:19:49:07 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b56858/initial] (2) [perdir /var/www/test/] strip document_root prefix: /var/www/test/info.php -> /test/info.php
127.0.0.1 - - [02/Feb/2015:19:49:07 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b56858/initial] (1) [perdir /var/www/test/] internal redirect with /test/info.php [INTERNAL REDIRECT]
127.0.0.1 - - [02/Feb/2015:19:49:07 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b54fe0/initial/redir#1] (3) [perdir /var/www/test/] strip per-dir prefix: /var/www/test/info.php -> info.php
127.0.0.1 - - [02/Feb/2015:19:49:07 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b54fe0/initial/redir#1] (3) [perdir /var/www/test/] applying pattern '^' to uri 'info.php'
127.0.0.1 - - [02/Feb/2015:19:49:07 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b54fe0/initial/redir#1] (4) [perdir /var/www/test/] RewriteCond: input='200' pattern='=' => not-matched
127.0.0.1 - - [02/Feb/2015:19:49:07 --0500] [localhost/sid#7f5a056a9880][rid#7f5a05b54fe0/initial/redir#1] (1) [perdir /var/www/test/] pass through /var/www/test/info.php

如您所见，此重写日志输出中未显示任何子请求