nginx配置转发socket请求

http {
    map $http_upgrade $connection_upgrade {
            default upgrade;
            ''      close;
    }

    server {
    ......
        location /ws {
            proxy_pass http://172.16.20.95:8081;
            proxy_http_version 1.1;

            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection $connection_upgrade;
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header X-Forwarded-Proto $scheme;

            proxy_read_timeout 600s;
        }
    ......
    }
}

http {
    # 要使用 $connection_upgrade 变量，必须首先使用 map 指令来定义它，
    map $http_upgrade $connection_upgrade {
            default upgrade;
            ''      close;
    }

    server {
    ......
        location /ws {
            # 代理到 WebSocket 服务器
            proxy_pass http://172.16.20.95:8081;
            # WebSocket 需要 HTTP/1.1
            proxy_http_version 1.1;

            # 设置 Upgrade 头部
            proxy_set_header Upgrade $http_upgrade;
            # 设置 Connection 头部
            proxy_set_header Connection $connection_upgrade;
            # 通常建议设置 Host 头部
            proxy_set_header Host $host;
            # 发送真实 IP
            proxy_set_header X-Real-IP $remote_addr;
            # 发送 X-Forwarded-For
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            # 发送协议，如 http 或 https
            proxy_set_header X-Forwarded-Proto $scheme;

            # 不设置超时，或者设置一个较 高的超时时间
            proxy_read_timeout 600s;
        }
    ......
    }
}

/ws 开头的路径，是 WebSocket 通信的常见前缀。
http块未配置map支持，nginx启动报错"unknown 'connection\_upgrade' variable"

解释

• map $http_upgrade $connection_upgrade：这条指令创建了一个新变量 $connection_upgrade，它基于 $http_upgrade 变量的值。
• default upgrade：如果 $http_upgrade 包含任何值，$connection_upgrade 将被设置为 "upgrade"。
• '' close：如果 $http_upgrade 是空的，$connection_upgrade 将被设置为 "close"。

参考：https://www.zhaokeli.com/article/8415.html

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