Nginx WebSocket代理配置

最新推荐文章于 2025-07-08 18:30:00 发布

阅读量1.7k

点赞数

分类专栏： nginx

nginx 专栏收录该内容

12 篇文章

订阅专栏

本文介绍了WebSocket协议如何通过HTTP Upgrade机制实现从HTTP到WebSocket的连接升级。探讨了WebSocket相较于HTTP的长连接特性及其对实时应用的支持，并讨论了反向代理服务器在支持WebSocket时面临的挑战。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

The WebSocket protocol is different from the HTTP protocol, but the WebSocket handshake is compatible with HTTP, using the HTTP Upgrade facility
 to upgrade the connection from HTTP to WebSocket. This allows WebSocket applications to more easily fit into existing infrastructures. For example, WebSocket applications can use the standard HTTP ports 80 and 443, thus allowing the use of existing firewall
 rules.

A WebSocket application keeps a long-running connection open between the client and the server, facilitating the development of real-time applications.
 The HTTP Upgrade mechanism used to upgrade the connection from HTTP to WebSocket uses the Upgrade and Connection headers. There are some challenges that a reverse proxy server faces in supporting WebSocket. One is that WebSocket is a hop-by-hop protocol, so
 when a proxy server intercepts an Upgrade request from a client it needs to send its own Upgrade request to the backend server, including the appropriate headers. Also, since WebSocket connections are long lived, as opposed to the typical short-lived connections
 used by HTTP, the reverse proxy needs to allow these connections to remain open, rather than closing them because they seem to be idle.

NGINX supports WebSocket by allowing a tunnel to be set up between a client and a backend server. For NGINX to send the Upgrade request from
 the client to the backend server, the Upgrade and Connection headers must be set explicitly

http {

map $http_upgrade $connection_upgrade {

default upgrade;

'' close;

}

upstream websocket {

server 192.168.100.10:8010;

}

server {

listen 8020;

location / {

proxy_pass http://websocket;

proxy_http_version 1.1;

proxy_set_header Upgrade $http_upgrade;

proxy_set_header Connection $connection_upgrade;

}

}

}