nginx解决socket.io、ws无法连接问题

nginx as webserver incl. socket.io and node.js / ws:// 400 Bad Request

location ~ ^/socket
    {
        proxy_pass
        proxy_redirect off;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header Host $http_host;
    }