Nginx 反向代理学习(一)

反向代理apache等http资源

## Basic reverse proxy server ##
upstream apachephp{
    server 127.0.0.1:8560; #php5.6
    server 127.0.0.1:8540; #php5.4
    server 127.0.0.1:8530; #php5.3
    server 127.0.0.1:8520; #php5.2
}
 
server {
    listen 8500;
    server_name  _;
 
    root   html;
    index  index.php;
 
    ## send request back to apache ##
    location / {
        proxy_pass  http://apachephp;
 
        #Proxy Settings
        proxy_redirect     off;
        #proxy_set_header   Host             $host;
        proxy_set_header   Host             $http_host;
        proxy_set_header   X-Real-IP        $remote_addr;
        proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
        proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504;
        proxy_max_temp_file_size 0;
        proxy_connect_timeout      90;
        proxy_send_timeout         90;
        proxy_read_timeout         90;
        proxy_buffer_size          4k;
        proxy_buffers              4 32k;
        proxy_busy_buffers_size    64k;
        proxy_temp_file_write_size 64k;
   }
}

配置解释：

$host、$http_host和$remote_addr都均为nginx导出变量，可以再配置文件中直接使用。

如果Host请求头部没有出现在请求头中，则$http_host值为空。

$host值为主域名

$http_host为当前http请求头