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Notes on the limit_traffic_rate module
=====

To install, compile nginx with this ./configure option:

    --add-module=path/to/this/directory

Nginx directive limit_rate could limit connection's speed, and limit_conn 
could limit connection number by given variable. If the client is a browser,
 it only open one connection to the server. The speed will be limited to 
limit_rate, unless the client is a multi-thread download tool.

Limit_traffic_rate module provides a method to limit the total download rate
 by client IP or download URL, even there are several connections. The 
limit condition could be defined by the following directive.

The limit_traffic_rate module need to use a share memory pool. Directive 
syntax is same to limit_zone. 

    http {
        #limit_traffic_rate_zone   rate $request_uri 32m;
        limit_traffic_rate_zone   rate $remote_addr 32m;
        
        server {
            location /download/ {
                limit_traffic_rate  rate 20k;
            }
        }
    }

Changelogs
  v0.2 
    *   modify algorithm, rate = (limit - last_rate)/conn + last_rate
  v0.1
    *   first release

License
=====

Same as nginx:

/* 
 * Copyright (C) 2010 Simon([email protected])
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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 AUTHOR 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 AUTHOR 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 LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */