Module ngx_http_api_module
Enables collection of virtual http or stream server status information in the specified zone. Several servers may share the same zone. Starting from 1.17.0, status information can be collected per location. The special value off disables statistics collection in nested location blocks. Note that the statistics is collected in the context of a location where processing ends. It may be different fro
Development guide
For general purposes, nginx code uses two integer types, ngx_int_t and ngx_uint_t, which are typedefs for intptr_t and uintptr_t respectively. Most functions in nginx return the following codes: NGX_OK — Operation succeeded. NGX_ERROR — Operation failed. NGX_AGAIN — Operation incomplete; call the function again. NGX_DECLINED — Operation rejected, for example, because it is disabled in the configur
Module ngx_http_auth_request_module
The ngx_http_auth_request_module module (1.5.4+) implements client authorization based on the result of a subrequest. If the subrequest returns a 2xx response code, the access is allowed. If it returns 401 or 403, the access is denied with the corresponding error code. Any other response code returned by the subrequest is considered an error. For the 401 error, the client also receives the “WWW-Au
Module ngx_http_headers_module
The ngx_http_headers_module module allows adding the “Expires” and “Cache-Control” header fields, and arbitrary fields, to a response header. expires 24h; expires modified +24h; expires @24h; expires 0; expires -1; expires epoch; expires $expires; add_header Cache-Control private;
Controlling nginx
In order for nginx to re-read the configuration file, a HUP signal should be sent to the master process. The master process first checks the syntax validity, then tries to apply new configuration, that is, to open log files and new listen sockets. If this fails, it rolls back changes and continues to work with old configuration. If this succeeds, it starts new worker processes, and sends messages
Module ngx_http_proxy_module
Makes outgoing connections to a proxied server originate from the specified local IP address with an optional port (1.11.2). Parameter value can contain variables (1.3.12). The special value off (1.3.12) cancels the effect of the proxy_bind directive inherited from the previous configuration level, which allows the system to auto-assign the local IP address and port. The transparent parameter (1.1
HttpLogModule
The ngx_http_log_module module writes request logs in the specified format. Requests are logged in the context of a location where processing ends. It may be different from the original location, if an internal redirect happens during request processing. log_format compression '$remote_addr - $remote_user [$time_local] ' '"$request" $status $bytes_sent ' '"$http_referer" "$http_user_agent" "$gzip_
Module ngx_http_limit_req_module
Sets the shared memory zone and the maximum burst size of requests. If the requests rate exceeds the rate configured for a zone, their processing is delayed such that requests are processed at a defined rate. Excessive requests are delayed until their number exceeds the maximum burst size in which case the request is terminated with an error. By default, the maximum burst size is equal to zero. Fo
How nginx processes a request
nginx first decides which server should process the request. Let’s start with a simple configuration where all three virtual servers listen on port *:80: server { listen 80; server_name example.org www.example.org; ... } server { listen 80; server_name example.net www.example.net; ... } server { listen 80; server_name example.com www.example.com; ... } In this configuration nginx tests only the re
Configuring HTTPS servers
To configure an HTTPS server, the ssl parameter must be enabled on listening sockets in the server block, and the locations of the server certificate and private key files should be specified: server { listen 443 ssl; server_name www.example.com; ssl_certificate www.example.com.crt; ssl_certificate_key www.example.com.key; ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3; ssl_ciphers HIGH:!aNULL:!MD5;
nginx
nginx [engine x] is an HTTP and reverse proxy server, a mail proxy server, and a generic TCP/UDP proxy server, originally written by Igor Sysoev. For a long time, it has been running on many heavily loaded Russian sites including Yandex, Mail.Ru, VK, and Rambler. According to Netcraft, nginx served or proxied 20.71% busiest sites in January 2024. Here are some of the success stories: Dropbox, Netf
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