我有一个带有 websocket-rails gem 的 Ruby on Rails 3.2 应用程序，在 nginx 反向代理后面的瘦网络服务器中运行。
除了 nginx 反向代理外，一切正常。通过删除 nginx 反向代理，websocket 通信就可以正常工作了。 （开发和生产）。使用 nginx 作为 websocket 的反向代理是问题的根源。
Nginx 版本1.3.13及以上版本应该能够支持 websocket 代理。基于文档here http://nginx.org/en/docs/http/websocket.html and here https://stackoverflow.com/questions/2419346/can-nginx-be-used-as-a-reverse-proxy-for-a-backend-websocket-server/14976998#14976998我创建了以下 nginx 配置：
map $http_upgrade $connection_upgrade {
default upgrade;
'' close;
}
upstream ravecy {
server localhost:3000;
server localhost:3001;
}
server {
listen 80;
server_name test.ravecy.com;
root /var/www/ravecy.com/public;
location / {
try_files $uri @ravecy;
}
location @ravecy {
proxy_pass http://ravecy;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection $connection_upgrade;
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_redirect off;
}
}
然而遗憾的是，这不起作用。我不完全知道为什么，但在我看来，nginx 没有将我的 websocket 连接尝试作为 websocket 连接处理，而是将常规 HTTP 连接处理，如日志所示：
==> production.log <==
Started GET "/chat" for 82.170.121.62 at 2013-04-10 12:20:12 +0200
Processing by ApplicationController#chat as HTML
Rendered application/chat.html.erb within layouts/frontend (0.2ms)
Rendered layouts/frontend/_navbar.html.erb (6.3ms)
Rendered layouts/shared/_alert.html.erb (0.0ms)
Rendered layouts/frontend/_facebook_sdk.html.erb (0.0ms)
Completed 200 OK in 9ms (Views: 8.4ms | ActiveRecord: 0.4ms)
Started GET "/websocket" for 82.170.121.62 at 2013-04-10 12:20:12 +0200
==> websocket_rails.log <==
I [2013-04-10 12:20:12.744] [ConnectionManager] Connection opened: #<Connnection::47398780>
I [2013-04-10 12:20:12.745] [Dispatcher] Started Event: client_connected
I [2013-04-10 12:20:12.745] [Dispatcher] Name: client_connected
I [2013-04-10 12:20:12.745] [Dispatcher] Data: {"connection_id"=>47398780}
I [2013-04-10 12:20:12.745] [Dispatcher] Connection: #<Connnection::47398780>
I [2013-04-10 12:20:12.747] [Dispatcher] Event client_connected Finished in 0.001960819 seconds
==> /var/log/nginx/access.log <==
82.170.121.62 - - [10/Apr/2013:12:20:12 +0200] "GET /chat HTTP/1.1" 200 854 "http://test.ravecy.com/posts" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_2) AppleWebKit/536.26.17 (KHTML, like Gecko) Version/6.0.2 Safari/536.26.17"
82.170.121.62 - - [10/Apr/2013:12:20:12 +0200] "GET /assets/frontend-6ad91089203a6026624ce015c2800492.css HTTP/1.1" 304 0 "http://test.ravecy.com/chat" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_2) AppleWebKit/536.26.17 (KHTML, like Gecko) Version/6.0.2 Safari/536.26.17"
82.170.121.62 - - [10/Apr/2013:12:20:12 +0200] "GET /assets/frontend-98fa493fc9f482c0d44b31bda5a89135.js HTTP/1.1" 304 0 "http://test.ravecy.com/chat" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_2) AppleWebKit/536.26.17 (KHTML, like Gecko) Version/6.0.2 Safari/536.26.17"
==> websocket_rails.log <==
I [2013-04-10 12:20:12.832] [ConnectionManager] Connection closed: #<Connnection::47398780>
I [2013-04-10 12:20:12.832] [Dispatcher] Started Event: client_disconnected
I [2013-04-10 12:20:12.832] [Dispatcher] Name: client_disconnected
I [2013-04-10 12:20:12.832] [Dispatcher] Data: nil
I [2013-04-10 12:20:12.832] [Dispatcher] Connection: #<Connnection::47398780>
I [2013-04-10 12:20:12.833] [Dispatcher] Event client_disconnected Finished in 0.000293462 seconds
==> /var/log/nginx/access.log <==
82.170.121.62 - - [10/Apr/2013:12:20:12 +0200] "GET /websocket HTTP/1.1" 200 398 "-" "-"
请注意，连接会在 100 毫秒内关闭，即使它应该保持活动状态。
进一步配置：
nginx.conf：
user www-data;
worker_processes 4;
pid /run/nginx.pid;
events {
worker_connections 768;
}
http {
sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
types_hash_max_size 2048;
include /etc/nginx/mime.types;
default_type application/octet-stream;
access_log /var/log/nginx/access.log;
error_log /var/log/nginx/error.log;
gzip on;
gzip_disable "msie6";
include /etc/nginx/conf.d/*.conf;
include /etc/nginx/sites-enabled/*;
}
瘦配置：
---
chdir: /var/www/ravecy.com
environment: production
address: 127.0.0.1
port: 3000
timeout: 30
log: log/thin.log
pid: tmp/pids/thin.pid
max_conns: 1024
max_persistent_conns: 100
require: []
wait: 30
servers: 2
daemonize: true
nginx 版本：
nginx/1.3.15
实时示例网址：http://test.ravecy.com/chat http://test.ravecy.com/chat
另请注意：执行时new WebSocket("ws://test.ravecy.com/websocket")在JS控制台中，
浏览器提示“意外响应代码：200”。
我非常渴望完成这项工作，并且不再知道自己应该做什么。
NGINX 的 Telnet 结果：
GET /websocket HTTP/1.1
Host: test.ravecy.com
Connection: Upgrade
Upgrade: WebSocket
HTTP/1.1 200 OK
Server: nginx/1.3.15
Date: Sat, 13 Apr 2013 19:50:35 GMT
Content-Type: text/json
Transfer-Encoding: chunked
Connection: keep-alive
152
[["client_connected",{"id":null,"channel":null,"data":{"connection_id":37160040},"success":null,"result":null,"server_token":null}]][["users",{"id":null,"channel":null,"data":[],"success":null,"result":null,"server_token":null}]][["client_connected",{"id":null,"channel":null,"data":{},"success":false,"result":null,"server_token":null}]]
Telnet结果直接瘦：
GET /websocket HTTP/1.1
Host: test.ravecy.com
Connection: Upgrade
Upgrade: WebSocket
HTTP/1.1 101 Web Socket Protocol Handshake
Upgrade: WebSocket
Connection: Upgrade
WebSocket-Origin:
WebSocket-Location: ws://test.ravecy.com/websocket
[["client_connected",{"id":null,"channel":null,"data":{"connection_id":37489460},"success":null,"result":null,"server_token":null}]][["users",{"id":null,"channel":null,"data":[],"success":null,"result":null,"server_token":null}]][["client_connected",{"id":null,"channel":null,"data":{},"success":false,"result":null,"server_token":null}]]
显然，这是出了问题。但为什么？
