Description:
------------
Apache HTTP Server 2.3 is about to enter beta in preparation for a
general availability release of 2.4 soon, see:

http://marc.info/?l=apache-httpd-dev&m=129900037316343&w=2

Apache HTTP Server 2.3 comes with mod_proxy_fcgi as a standard module;
mod_fcgid and mod_fastcgi are not standard modules.  Unfortunately,
mod_proxy_fcgi and php-fpm do not work with each other.  One problem
is already being addressed on the Apache end:
http://marc.info/?l=apache-httpd-dev&m=129900037316343&w=2

There are two problems that, in my opinion, are best addressed
on the PHP end of things (patch attached).  php-fpm will then
work out of the box with mod_proxy_fcgi:

Problem 1:

PHP relies on the SCRIPT_FILENAME environment variable to find the script
to execute in the filesystem.  (It can also use SCRIPT_NAME for this, but
that will fail if the document root for php-fpm does not match the document
root of the httpd proxy).  In Apache HTTP Server 2.3, all proxy modules
prefix SCRIPT_FILENAME with "proxy:" followed by a protocol name, for
example, when the user requests

    https://server-name/test/test.php

Apache HTTP Server sets SCRIPT_FILENAME to

    proxy:fcgi://127.0.0.1:9000/www/php-ssl/test.php/extra/stuff

The attached patch causes php-fpm to recognize the "proxy:"
convention in this case, and skip over the subsequent protocol,
hostname and port.  In this example, SCRIPT_FILENAME then becomes

    /www/php-ssl/test.php/extra/stuff

...which php-fpm is able to deal with correctly.

I believe that PHP is the correct place to change this, rather than in
Apache HTTP Server, since the proxy (httpd) and origin (php-fpm, in this
case) may be on different servers machine and httpd should not make
assumptions about the origin's document root or URI path namespace mapping.


Problem 2:

Apache HTTP Server is not able to set a value for PATH_INFO and still
comply with RFC 3875, for the reasons in the last paragraph above.

sapi/fpm/fpm/fpm_main.c:init_request_info() will find the base script
using SCRIPT_FILENAME, but uses this to calculate and offset into the
original PATH_INFO environment variable.  Since no such environment
variable exists (if the patch to Apache HTTP Server is applied),


Additional notes:

Except for 21 additional lines in the fpm version, the code in
init_request_info() is duplicated in the following two files
(378 identical lines in the two versions of this one function):

sapi/fpm/fpm/fpm_main.c
sapi/cgi/cgi_main.c

The changes in the attached patch are made to both files.  While
they are only really needed in sapi/fpm/fpm/fpm_main.c, making the
changes in both places should do no harm, will permit the cgi sapi
to be used more flexibly, and be more consistent overall by
minimizing special cases.

----

Using php5.3-201103031330 snapshot.
no changes to php.ini

Fedora 14, 64-bit (fully patched)
gcc 4.5.1

./configure --build=x86_64-unknown-linux-gnu --host=x86_64-unknown-linux-gnu --program-prefix= --disable-dependency-tracking --prefix=/usr --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc --datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib64 --libexecdir=/usr/libexec --localstatedir=/var --sharedstatedir=/var/lib --mandir=/usr/share/man --infodir=/usr/share/info --cache-file=../config.cache --with-libdir=lib64 --with-config-file-path=/etc --with-config-file-scan-dir=/etc/php.d --disable-debug --with-pic --disable-rpath --without-pear --with-bz2 --with-exec-dir=/usr/bin --with-freetype-dir=/usr --with-png-dir=/usr --with-xpm-dir=/usr --enable-gd-native-ttf --with-t1lib=/usr --without-gdbm --with-gettext --with-gmp --with-iconv --with-jpeg-dir=/usr --with-openssl --with-pcre-regex=/usr --with-zlib --with-layout=GNU --enable-exif --enable-ftp --enable-magic-quotes --enable-sockets --with-kerberos --enable-ucd-snmp-hack --enable-shmop --enable-calendar --without-sqlite --with-libxml-dir=/usr --enable-xml --with-system-tzdata --enable-force-cgi-redirect --enable-pcntl --with-imap=shared --with-imap-ssl --enable-mbstring=shared --enable-mbregex --with-gd=shared --enable-bcmath=shared --enable-dba=shared --with-db4=/usr --with-xmlrpc=shared --with-ldap=shared --with-ldap-sasl --with-mysql=shared,/usr --with-mysqli=shared,/usr/lib64/mysql/mysql_config --with-interbase=shared,/usr/lib64/firebird --with-pdo-firebird=shared,/usr/lib64/firebird --enable-dom=shared --with-pgsql=shared --enable-wddx=shared --with-snmp=shared,/usr --enable-soap=shared --with-xsl=shared,/usr --enable-xmlreader=shared --enable-xmlwriter=shared --with-curl=shared,/usr --enable-fastcgi --enable-pdo=shared --with-pdo-odbc=shared,unixODBC,/usr --with-pdo-mysql=shared,/usr/lib64/mysql/mysql_config --with-pdo-pgsql=shared,/usr --with-pdo-sqlite=shared,/usr --with-pdo-dblib=shared,/usr --with-sqlite3=shared,/usr --enable-json=shared --enable-zip=shared --without-readline --with-libedit --with-pspell=shared --enable-phar=shared --with-mcrypt=shared,/usr --with-tidy=shared,/usr --with-mssql=shared,/usr --enable-sysvmsg=shared --enable-sysvshm=shared --enable-sysvsem=shared --enable-posix=shared --with-unixODBC=shared,/usr --enable-fileinfo=shared --enable-intl=shared --with-icu-dir=/usr --with-enchant=shared,/usr --with-recode=shared,/usr --enable-fpm


Test script:
---------------
<html>
  <head> <title>php-fpm test</title> </head>
  <body> <?php phpinfo(); ?> </body>
</html>


Expected result:
----------------
1. Save the script in the file file /www/php-ssl/test.php

2. Build Apache HTTP Server 2.3.10 alpha with the patch in

https://issues.apache.org/bugzilla/show_bug.cgi?id=50851

(Note: without the patch to httpd, httpd sets PATH_INFO incorrectly, which
makes the result from php-fpm incorrect with or without the patch to PHP
included in this PHP bug report).

3. Configure httpd to act as a reverse proxy for php-fpm by adding the following to httpd.conf:

ProxyPass /test/ fcgi://127.0.0.1:9000/www/php-ssl/

4. Run the script by requesting:

https://server-name/test/test.php/extra/stuff

The script executes, producing a phpinfo() page.  In the "PHP Variables"
section of the page, the following are expected after the attached patch
is applied:

_SERVER["SCRIPT_FILENAME"]      /www/php-ssl/test.php
_SERVER["REQUEST_URI"]          /test/test.php/extra/stuff
_SERVER["PATH_INFO"]            /extra/stuff
_SERVER["PATH_TRANSLATED"]      /www/html-ssl/extra/stuff
_SERVER["ORIG_SCRIPT_FILENAME"] /www/php-ssl/test.php/extra/stuff



Actual result:
--------------
php-fpm returns a HTTP 404 (Not Found) response to the Apache HTTP Server
proxy.