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upstream websocket {
    server localhost:3000;
}

server {
    listen       80;
    server_name  localhost;

    access_log  /var/log/nginx/websocket.access.log  main;

    location /socket.io/ {
        proxy_pass http://websocket;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
    }

    location /socket.io/socket.io.js {
        proxy_pass http://websocket;
    }

    location /sample.html {
        root   /usr/share/nginx/html/;
    }
}