@pitaj Yes, you are right. And I find that post will be marked as spam if there are too many codes.

file: src/socket.io/index, line:45

// other code
// added code, force to resign variable
		domain = parsedUrl.hostname;
// comment these codes
//		if (!domain) {
//			domain = parsedUrl.hostname;	// cookies don't provide isolation by port: http://stackoverflow.com/a/16328399/122353
//		}
// other code

After a hard time debugging, I found out that it's not because of nginx setting. It is because I set a "cookieDomain" config. After I remove this one, it works properly. I modify source code and fix this problem. Maybe it's not a good solution, but it works for me.

@julian thx, I've solved this problem. But I can't post my solution because the stupid robot marked my post as spam.

akismet is so stupid! It maked my post as spam again. Although I've solve my problem, I can't reply it!!!

@pitaj ok, I got it.

@pitaj My nginx directory only has these sub dirs:

 client_body_temp  conf  fastcgi_temp  html  logs  proxy_temp  sbin  scgi_temp  uwsgi_temp

And even I do what you said, nginx still not working. I seems that my nginx can only set config by conf/nginx.conf file. sites-available/ and sites-enabled/ seems useless to me.

@pitaj
My nginx dir only has these dirs:

@pitaj because my nginx has other services. I have to follow previous configs. Anyway, I'll try what you said.

@jenkler well, that's because I edit it.

@jenkler works fine?

well, though nodebb websocket cannot be connected, a simple websocket server I wrote can be connected. I use the same config :

  upstream acp_io_nodes { 
    #ip_hash; 
    server localhost:3434;   
  } 
 server { 
    listen       80; 
    server_name  test1-forum-acp.ezsport.cc; 
    location / { 
      proxy_pass http://acp_io_nodes; 
      proxy_read_timeout 300s; 
      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_http_version 1.1; 
      proxy_set_header Upgrade $http_upgrade; 
      proxy_set_header Connection $connection_upgrade; 
               } 
       } 

here is my server's code:

console.log("Server started"); 
var Msg = ''; 
var WebSocketServer = require('ws').Server 
    , wss = new WebSocketServer({port: 3434}); 
    wss.on('connection', function(ws) { 
        ws.on('message', function(message) { 
        console.log('Received from client: %s', message); 
        ws.send('Server received from client: ' + message); 
    }); 
 }); 

Hope someone will rescue me soon.

@jenkler What do you mean? I can't understand. I think do not have multi threads. It mark my post as spam again.

@jenkler it seems that it marks my post as spam base on post content.

I've searched for a whole day, and of course I searched in nodeBB first. But I cannot find a post that solves my problem. So I ask for help here. Please do not mark my post as spam again.

I've read nginx config document, and I've done most of the configs. But it still doesn't work . The queer thing is that it works well in my mac, but it does not work in my server.
My server is CentOS release 6.6 (Final).

And I cannot understand these things:
/path/to/nginx/sites-available/* -- files here must be aliased to ../sites-enabled(my nginx does not have such directory)
/path/to/nginx/conf.d/*.conf -- filenames must end in .conf
/path/to/nginx/httpd.conf -- if all else fails (What does it mean?)

Here is my error informations:
WebSocket connection to 'ws://test1-forum-acp.ezsport.cc/socket.io/?EIO=3&transport=websocket' failed: Error during WebSocket handshake: Unexpected response code: 400

Here is my config:

user              nginx;
worker_processes  2;

error_log  /mnt/logs/nginx/error.log;

pid        /var/run/nginx.pid;


events {
    worker_connections  1024;
}
http {
    include       mime.types;
    default_type  application/octet-stream;

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /mnt/logs/nginx/access.log  main;
    server_names_hash_bucket_size   64;

    sendfile        on;
    keepalive_timeout  65;
    server {
        listen       80;
        server_name  localhost;

        location / {
            root   html;
            index  index.html index.htm;
        }

        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }
    }
   
    include /etc/nginx1.8/conf/conf.d/*.conf; 
}

conf.d/ includes config file blow

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

server {
        listen 80;
        client_max_body_size 5m;

        server_name  test1-forum-acp.ezsport.cc;
        location / {
		proxy_set_header X-Forwarded-Proto $scheme;
		proxy_set_header X-NginX-Proxy true;

		proxy_pass http://acp_io_nodes;
		proxy_redirect off;

		# Socket.IO Support
	        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_http_version 1.1;
	        proxy_set_header Upgrade $http_upgrade;
	        proxy_set_header Connection $connection_upgrade;
        }
}
upstream acp_io_nodes {
    ip_hash;
    server 127.0.0.1:5568;
}

@jenkler I found it when I want to edit my post. After it maked, I post a second one. Then it maked again.

I just wanna why. Isn't here the place where developer can ask for hlep?