将 websocket 流量从 nginx 1.3.13 代理到 socket.io（无 SSL）

Question

截至 2 天前，nginx 开始支持 websocket 连接，因此我试图让我的 nginx-nodejs-socket.io 应用程序在没有 HAproxy 等的情况下工作（虽然运气不好）。

我真正想要实现的是 nginx 仅将 websocket 连接请求发送到支持的服务器，或者更准确地说是 websocket 服务器，socket.io，同时 nginx 将提供 php 文件，以及包括 html 文件在内的所有静态内容.我根本不想 express 提供静态内容（如果可能的话）。

这是我的 nginx.conf

#user  nobody;
worker_processes  1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/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  logs/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    gzip  on;

    upstream backend {
        server 127.0.0.1:8080;
    }

    server {
        listen       80;
        server_name  localhost;

        charset UTF-8;

        #access_log  logs/host.access.log  main;

        location / {
            root   /website/html_public;
            index  index.php index.html index.htm;
        }       
        #error_page  404              /404.html;

        # redirect server error pages to the static page /50x.html
        #
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   /website/html_public;
        }

        # proxy the PHP scripts to Apache listening on 127.0.0.1:80
        #
        #location ~ \.php$ {
        #    proxy_pass   http://127.0.0.1;
        #}

        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
        location ~ \.php$ {
        root           /website/html_public;
        try_files      $uri =404;
        fastcgi_pass   unix:/tmp/php5-fpm.sock;
        fastcgi_index  index.php;
        fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
        include        fastcgi_params;
        }

        # deny access to .htaccess files, if Apache's document root
        # concurs with nginx's one
        #
        location ~ /\.ht {
            deny  all;
        }

         location /connection {
         proxy_pass http://backend;  
         proxy_http_version 1.1;
         proxy_set_header Upgrade $http_upgrade;
         proxy_set_header Connection "upgrade";
             }
       }

    # another virtual host using mix of IP-, name-, and port-based configuration
    #
    #server {
    #    listen       8000;
    #    listen       somename:8080;
    #    server_name  somename  alias  another.alias;

    #    location / {
    #        root   /website/html_public;
    #        index  index.php index.html index.htm;
    #    }
    #}
}

这是我在节点中的 server.js 文件

#user  nobody;
worker_processes  1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/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  logs/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    gzip  on;

    upstream backend {
        server 127.0.0.1:8080;
    }

    server {
        listen       80;
        server_name  localhost;

        charset UTF-8;

        #access_log  logs/host.access.log  main;

        location / {
            root   /website/html_public;
            index  index.php index.html index.htm;
        }       
        #error_page  404              /404.html;

        # redirect server error pages to the static page /50x.html
        #
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   /website/html_public;
        }

        # proxy the PHP scripts to Apache listening on 127.0.0.1:80
        #
        #location ~ \.php$ {
        #    proxy_pass   http://127.0.0.1;
        #}

        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
        location ~ \.php$ {
        root           /website/html_public;
        try_files      $uri =404;
        fastcgi_pass   unix:/tmp/php5-fpm.sock;
        fastcgi_index  index.php;
        fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
        include        fastcgi_params;
        }

        # deny access to .htaccess files, if Apache's document root
        # concurs with nginx's one
        #
        location ~ /\.ht {
            deny  all;
        }

         location /connection {
         proxy_pass http://backend;  
         proxy_http_version 1.1;
         proxy_set_header Upgrade $http_upgrade;
         proxy_set_header Connection "upgrade";
             }
       }

    # another virtual host using mix of IP-, name-, and port-based configuration
    #
    #server {
    #    listen       8000;
    #    listen       somename:8080;
    #    server_name  somename  alias  another.alias;

    #    location / {
    #        root   /website/html_public;
    #        index  index.php index.html index.htm;
    #    }
    #}
}

从我的客户端，尝试像这样连接：

socket = new io.connect('http://localhost/connection');

问题是当我尝试正常连接时，在chrome浏览器中输入localhost，我在控制台看到：

GET http://localhost/socket.io/socket.io.js 404 (Not Found)

而且当在浏览器中输入时：http://localhost/connection 我收到“无法获取/连接”，这告诉我 nginx 没有使用我当前的配置正常代理 websockets。

Answer 1

socket.io 有点偷偷摸摸，因为它从 node_modules 目录中的某个位置自动提供客户端脚本 socket.io.js 。

所以你要做的就是告诉 nginx 也将对该位置的请求传递给你的 Node.js。在我的 nginx.conf 中我有：

    location /chat {
        proxy_pass http://backend;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
    }

    location /socket.io {
        proxy_pass http://backend;
    }

然而，这只能让我到目前为止 websocket 连接然后失败并出现 502“坏网关”错误。

之后，socket.io 又依赖 xhr-polling，这是非常非常慢的。