怎么在Nginx中配置反向代理并清除缓存

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#user nobody;

worker_processes 1;

#error_log logs/error.log;

#error_log logs/error.log notice;

#error_log logs/error.log info;

#pid    logs/nginx.pid;

events {

  worker_connections 1024;

}

Http {

  log_fORMat main '$remote_addr - $remote_user [$time_local] "$request" '

           '$status $body_bytes_sent "$http_referer" '

           '"$http_user_agent" "$http_x_forwarded_for"'

       '$upstream_addr $upstream_status $request_time $upstream_response_time';

  access_log /var/log/nginx/access.log main;

  error_log  /var/log/nginx/error.log;

  server_tokens off;

  include    mime.types;

  default_type application/octet-stream;

  sendfile    on;

  tcp_nopush   on;

  client_max_body_size 10m;

  client_body_buffer_size 128k;

  proxy_connect_timeout 300;

  proxy_send_timeout 300;

  proxy_read_timeout 300;

  proxy_buffer_size 64k;

  proxy_buffers 4 512k;

  proxy_busy_buffers_size 512k;

  proxy_temp_file_write_size 512k;

  proxy_temp_path  /data/nginx/proxy_temp;

  proxy_cache_path /data/nginx/proxy_cache levels=1:2 keys_zone=cache_one:2000m inactive=3D max_size=500g;

  proxy_redirect off;

  proxy_set_header Host $host;

  proxy_set_header X-Real-IP $remote_addr;

  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

  gzip on;

  gzip_min_length 1k;

  gzip_buffers 4 16k;

  gzip_http_version 1.1;

  gzip_comp_level 2;

  gzip_types text/plain application/x-javascript text/CSS application/xml;

  gzip_vary on;

  upstream Go {

    server www.cnblogs.com:80 weight=4;

    #server 42.121.252.58:80 weight=4;

  }

  server {

      listen  192.168.55.133:80;

      #server_name www.cnblogs.com;

      access_log /var/log/nginx/go.access.log main;

      error_log  /var/log/nginx/go.error.log error;

      location / {

          proxy_cache cache_one;

          #proxy_cache_valid 200 304 301 302 2h;

          #proxy_cache_valid any 2h;

          #expires 1d;

          add_header X-Cache $upstream_cache_status;

          proxy_pass http://go;

          proxy_cache_key  $uri$is_args$args;

      }

      location ~ /purge(/.*) {

        allow       127.0.0.1;

        allow       192.168.55.0/24;

        deny        all;

        proxy_cache_purge cache_one $1$is_args$args;

    }

  }

}