使用WebSocket在测试环境中一切正常,在生产环境中后端出现如下错误:
org.springframework.web.socket.server.support.DefaultHandshakeHandler: Handshake failed due to invalid Upgrade header: null
因为WebSocket 是在客户端和服务器之间保持长连接的方式运行,与普通的HTTP短链接的方式不同,所以在NGINX需要通过使用Upgrade和Connection将连接从 HTTP 升级到 WebSocket 的 HTTP。
https://www.nginx.com/blog/websocket-nginx/
解决办法:在Nginx 的location中添加以下代码:
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";
location /wsapp/ {
proxy_pass http://wsbackend;
proxy_http_version 1.1;
proxy_set_header Host $host;
# enables WS support
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "Upgrade";
}