场景：1台nginx去代理4台apache
需求：根据不同的请求uri 代理到不同的apache
nginx的配置文件为：
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upstream aa.com {
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server 192.168.0.121;
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server 192.168.0.122;
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}
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upstream bb.com {
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server 192.168.0.123;
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server 192.168.0.124;
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}
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server {
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listen 80;
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server_name www.abc.com;
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location ~ aa.php
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{
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proxy_pass http://aa.com/;
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proxy_set_header Host $host;
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proxy_set_header X-Real-IP $remote_addr;
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proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
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}
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location ~ bb.php
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{
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proxy_pass http://bb.com/;
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proxy_set_header Host $host;
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proxy_set_header X-Real-IP $remote_addr;
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proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
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}
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}