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我在带有粘性会话的 nginx 代理后面运行了几个sails.js 后端实例。

我一直在我的 nginx error.log 中看到很多关于sails.js /socket.io/ URL 超时的消息：

2016/01/04 20:55:15 [error] 12106#12106: *402088 upstream timed out (110: Connection timed out) while reading response header from upstream, client: x.x.x.x, server: example.com, request: "GET /socket.io/?__sails_io_sdk_version=0.11.0&__sails_io_sdk_platform=browser&__sails_io_sdk_language=javascript&EIO=3&transport=polling&t=1451930055065-4&sid=jvekCYDAcFfu0PLdAAL6 HTTP/1.1", upstream: "http://127.0.0.1:3001/socket.io/?__sails_io_sdk_version=0.11.0&__sails_io_sdk_platform=browser&__sails_io_sdk_language=javascript&EIO=3&transport=polling&t=1451930055065-4&sid=jvekCYDAcFfu0PLdAAL6", host: "example.com", referrer: "https://example.com/languageExchange/chat/63934"

2016/01/04 20:55:17 [error] 12105#12105: *402482 upstream prematurely closed connection while reading response header from upstream, client: y.y.y.y, server: example.com, request: "GET /socket.io/?__sails_io_sdk_version=0.11.0&__sails_io_sdk_platform=browser&__sails_io_sdk_language=javascript&EIO=3&transport=websocket&sid=QnAe1jiKEHgj-zlKAAKu HTTP/1.1", upstream: "http://127.0.0.1:3001/socket.io/?__sails_io_sdk_version=0.11.0&__sails_io_sdk_platform=browser&__sails_io_sdk_language=javascript&EIO=3&transport=websocket&sid=QnAe1jiKEHgj-zlKAAKu", host: "example.com"

2016/01/04 22:32:33 [error] 12107#12107: *437054 no live upstreams while connecting to upstream, client: z.z.z.z, server: example.com, request: "GET /socket.io/?__sails_io_sdk_version=0.11.0&__sails_io_sdk_platform=browser&__sails_io_sdk_language=javascript&EIO=3&transport=websocket&sid=8G2TfOsNOJMYHZOjAAD3 HTTP/1.1", upstream: "http://sails/socket.io/?__sails_io_sdk_version=0.11.0&__sails_io_sdk_platform=browser&__sails_io_sdk_language=javascript&EIO=3&transport=websocket&sid=8G2TfOsNOJMYHZOjAAD3", host: "example.com"

并非每个客户端都会发生这种情况，但此类消息的数量很大。并且sails.js 没有显示任何相关错误。

我应该如何调查这些问题的性质？

这是我到目前为止尝试过的（但没有帮助）：

  • 将socket.io客户端升级到目前最新版本（1.3.7）
  • 在 nginx 中显式关闭 /socket.io/ 请求的缓存

这是相关的配置文件：

帆 sockets.js：

adapter: 'socket.io-redis'

nginx：

    location ^~ /socket.io/ {
        proxy_pass http://sails;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $connection_upgrade;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Host $http_host;
        proxy_no_cache true;
        proxy_cache_bypass true;
        proxy_redirect off;
        proxy_intercept_errors off;
}
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