# the 90 port
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    server {
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        listen       90; 
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        server_name  xxxxxx;
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        proxy_set_header X-Forwarded-Host $host;
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        proxy_set_header X-Forwarded-Server $host;
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        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
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        proxy_set_header Host $host:$server_port; #这里是重点,这样配置才不会丢失端口,这里换成你自己的ip和端口（$host:$seerver_port）
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        location / {
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                proxy_pass http://127.0.0.1:9001;
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        }
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        location = /50x.html {
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            root   html;
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        }
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    }