根据头部信息http header控制nginx选择反向代理服务器

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http://www.111cn.net/sys/nginx/68133.htm

好吧。本来想多写点的，现在没时间，太监了。
说下核心：客户端自定义的http header，在nginx的配置文件里能直接读取到。
条件：header必须用减号“-”分隔单词，nginx里面会转换为对应的下划线“_”连接的小写单词。
nginx配置：

代码如下复制代码location / {
if ($http_my_custom_header ~ (d+) ) {
rewrite / http://www.111cn.net/ last;
}
}

测试：

代码如下复制代码wget --header="my-custom-header:1" -d http://www.111cn.net

DEBUG output created by Wget 1.13.4 on linux-gnu.

URI encoding = `UTF-8'
--2014-04-28 09:48:40-- http://www.111cn.net/
Resolving www.111cn.net (www.111cn.net)... 172.31.30.70
Caching www.111cn.net => 172.31.30.70
Connecting to www.111cn.net |172.31.30.70|:80... connected.
Created socket 3.
Releasing 0x084e3e18 (new refcount 1).

---request begin---
GET / HTTP/1.1
User-Agent: Wget/1.13.4 (linux-gnu)
Accept: */*
Host: www.111cn.net
Connection: Keep-Alive
my-custom-header: 1

---request end---
HTTP request sent, awaiting response...
---response begin---
HTTP/1.1 302 Moved Temporarily
Server: nginx/1.1.19
Date: Mon, 28 Apr 2014 09:48:40 GMT
Content-Type: text/html
Content-Length: 161
Connection: keep-alive
Location: http://www.111cn.net

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