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Patch for upstream HTTP protocol keepalive

branch: master
README
==NOTICE=
This patch may be just usable under the version of Nginx_1.0.5. It just adds the
support for the upstream keepalive connection and it isn't a completed HTTP/1.1
patch.

The core Nginx developer Maxim Dounin has released a completed patch for Nginx
HTTP/1.1 proxying (http://forum.nginx.org/read.php?2,213207). It will be merged
into the 1.1.x branch of Nginx(http://mailman.nginx.org/pipermail/nginx-devel/2011-July/001083.html).

This patch has merged into the Nginx-1.1.4 branch. 

I suggest you should use this patch. Good luck.

==INSTALLATION==
    
cd nginx-1.0.5
patch -p1 < /path/to/this/directory/upstream_keepalive_1.0.5.patch

#add the module
./configure --add-module=/path/to/this/directory


==EXAMPLE==

upstream backends {
    server 10.0.0.1;
    server 10.0.0.2;

    keepalive 128;
}

Append the header of "Connection: keep-alive" with the proxy packet:

location /foo {
    proxy_set_header Connection "keep-alive";
    proxy_pass http://backends;
}

The ngx_http_upstream_keepalive_module's document is here:
https://github.com/yaoweibin/nginx_upstream_keepalive_patch/raw/master/ngx_http_upstream_keepalive/README

Notice that, this module keep connections in a pool. All the backend connections
will not be timeout or closed actively by this module, unless the backend 
server close the connection.  

==COPYRIGHT & LICENSE==

This original patch and ngx_http_upstream_keepalive_module is written by 
Maxim Dounin and published under the BSD license.

This patch is also published under the BSD license.

Copyright (C) 2011 by Weibin Yao <yaoweibin@gmail.com>.

Thanks to Simpli.fi to sponsor this patch.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

*   Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.

*   Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in the
    documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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