Nginx Reverse proxy configuration and optimization-nginx optimization

The environment is Windows + nginx. (the latest version is 1.5.10, which is recommended in the official documentation ).

1. Simple configuration to enable nginx to run first

Nginx configuration is relatively simple. Find the nginx. conf file in the conf directory and modify the following configuration:

The code is as follows:

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Server { Listen 80; // listening port bound Server_name www.111cn.net 111cn.net; // The bound domain name.   # Charset KOI8-R;   # Access_log logs/host. access. log main;   Location /{ Root html; Proxy_pass http: // 192.168.0.23: 81/; // The http server on the intranet Proxy_redirect off; Proxy_set_header Host $ proxy_host; // Host name and port of the backend server Proxy_set_header X-Real-IP $ remote_addr; // reverse proxy IP, where X-Real-IP is the custom request header Proxy_set_header X-Forwarded-For $ proxy_add_x_forwarded_for; Index. aspx default. aspx index.html index.htm; // default document         }

Note: proxy_set_header Host $ proxy_host; in this configuration, the official documentation is proxy_set_header Host $ host. However, after testing, reverse proxy cannot be enabled successfully, and no embedded variables in this document are $ host, I do not know whether the document is wrong or my understanding is wrong.
Switch cmd to the nginx Directory, run start nginx, and run nginx. there are two more nginx.exe processes in the process. run nginx-s stop to disable nginx and run nginx-s reload to restart nginx. note: if you disable or restart the command, you cannot disable nginx. If the configuration modification is invalid, check whether nginx actually exits.

2. Request header changes after reverse proxy

Let's take a look at what is added to the request header after reverse proxy is enabled. The code for retrieving the request header in the last php section

 

The code is as follows:	Copy code
<? Php $ Headers = array (); Foreach ($ _ SERVER as $ key => $ value ){ Echo $ key. "=". $ value; Echo "<br/> "; If ('http _ '= substr ($ key, 0, 5 )){ $ Headers [str_replace ('_', '-', substr ($ key, 5)] = $ value;     }  } ?>

After accessing this script through reverse proxy, the following results are obtained:

The code is as follows:

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USER = www HOME =/home/www FCGI_ROLE = RESPONDER GATEWAY_INTERFACE = CGI/1.1. SERVER_SOFTWARE = nginx/1.2.9 QUERY_STRING = REQUEST_METHOD = GET CONTENT_TYPE = CONTENT_LENGTH = SCRIPT_NAME =/tools/test. php REQUEST_URI =/tools/test. php DOCUMENT_URI =/tools/test. php DOCUMENT_ROOT =/web SERVER_PROTOCOL = HTTP/1.1 REMOTE_ADDR = 123.170.241.72 REMOTE_PORT = 11827 SERVER_ADDR = 103.251.91.175 SERVER_PORT = 80 SERVER_NAME = www.111cn.net REDIRECT_STATUS = 200 SCRIPT_FILENAME =/web/tools/test. php HTTP_HOST = 111cn.net HTTP_CONNECTION = keep-alive HTTP_CACHE_CONTROL = max-age = 0 HTTP_ACCEPT = text/html, application/xhtml + xml, application/xml; q = 0.9, image/webp, */*; q = 0.8 HTTP_USER_AGENT = Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/32.0.1700.107 Safari/537.36 HTTP_ACCEPT_ENCODING = gzip, deflate, sdch HTTP_ACCEPT_LANGUAGE = zh-CN, zh, q = 0.8 HTTP_COOKIE = wp-settings-1 = imgsize % 3 Dfull % 26 editor % 3 Dtinymce % 26 hidetb % 3D1% login % 3D1% 26 libraryContent % 3 Dbrowse % 26 align % 3 Dnone % 26 urlbutton % 3 dpost % 26 mfold % 3Do; wp-settings-time-1 = 1386907183; bd1__firstime = 1393228286385; wordpress_test_cookie = WP + Cookie + check; response = NINE % 7C1393388079% 7Cce226d537feb3af00ea52d0cf8d71600 PHP_SELF =/tools/test. php REQUEST_TIME = 1393261963.

3. Modify the code of the backend website

If the back-end website needs to obtain the visitor's IP address, the "REMOTE_ADDR" attribute in the request gets the ip address of the reverse proxy, in this case, the visitor's real IP address is obtained through the request header added when the reverse proxy forwards the request. currently, my backend website is. net.

The code is as follows:	Copy code
Public string getRequstAddr (HttpContext context ){ String ip; If (context. Request. ServerVariables ["HTTP_X_FORWARDED_FOR"]! = Null)     { String str = context. Request. ServerVariables ["HTTP_X_FORWARDED_FOR"]; String [] iparray = str. Split (','); Ip = iparray [0];     } Else { Ip = context. Request. ServerVariables ["REMOTE_ADDR"]. ToString ();     } Return ip; }