你能减少 Websocket 轮询请求吗答案

【问题标题】：Can you reduce Websocket polling request你能减少 Websocket 轮询请求吗
【发布时间】：2016-05-24 04:53:23
【问题描述】：

我正在使用 Websockets 将通信从网站发送到我使用 nodejs KOA 构建的后端服务器。我正在使用 websockets 库 1.4.x，它托管在 AWS elasticbeanstalk 中。我遇到的问题是每秒有太多轮询请求，AWS Elasticbeanstalk 已将我的集群分类为降级。该网站的使用率非常低，我实际上并没有向该网站推送任何内容。我正在使用 websockets 发送报告数据。我可能应该将其更改为使用 POST 或 AJAX，这将解决我的问题。但是，我想知道是否有人可以帮助解释为什么我看到这么多投票请求？对于每个加载了站点的客户端，它每秒都会发送一个轮询请求：

2016-05-24T03:33:37.025471Z 0.000037 0.001259 0.000019 400 400 3 41 "POST http://xxx.elb.amazonaws.com:80/socket.io/?EIO=3&transport=polling&t=LJWqo-g&sid=2p4uqRwRpgAGe9MYGEFw HTTP/1.1" "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.94 Safari/537.36" - -
2016-05-24T03:33:37.058664Z 0.000046 0.000801 0.000021 400 400 0 41 "GET http://xxx.elb.amazonaws.com:80/socket.io/?EIO=3&transport=websocket&sid=VGMrEcNWfe3V52xIBrsr HTTP/1.1" "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.94 Safari/537.36" - -
2016-05-24T03:33:37.068053Z 0.000026 0.001814 0.000017 400 400 3 41 "POST http://xxx.elb.amazonaws.com:80/socket.io/?EIO=3&transport=polling&t=LJWqq6w&sid=VGMrEcNWfe3V52xIBrsr HTTP/1.1" "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.94 Safari/537.36" - -
2016-05-24T03:33:37.114333Z 0.000027 0.001408 0.000028 200 200 0 101 "GET http://xxx.elb.amazonaws.com:80/socket.io/?EIO=3&transport=polling&t=LJWqptG HTTP/1.1" "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.94 Safari/537.36" - -
2016-05-24T03:33:37.204186Z 0.000049 0.000999 0.000018 400 400 0 41 "GET http://xxx.elb.amazonaws.com:80/socket.io/?EIO=3&transport=polling&t=LJWqpwy&sid=70GDwJbapBpe7xr0Brss HTTP/1.1" "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.94 Safari/537.36" - -
2016-05-24T03:33:37.222283Z 0.000027 0.002033 0.000019 200 200 0 101 "GET http://xxx.elb.amazonaws.com:80/socket.io/?EIO=3&transport=polling&t=LJWqpdt HTTP/1.1" "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.94 Safari/537.36" - -
2016-05-24T03:33:37.284256Z 0.00004 0.001299 0.00002 400 400 0 34 "GET http://xxx.elb.amazonaws.com:80/socket.io/?EIO=3&transport=websocket&sid=70GDwJbapBpe7xr0Brss HTTP/1.1" "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.94 Safari/537.36" - -
2016-05-24T03:33:37.304609Z 0.000025 0.000778 0.000016 400 400 3 41 "POST http://xxx.elb.amazonaws.com:80/socket.io/?EIO=3&transport=polling&t=LJWqpyM&sid=70GDwJbapBpe7xr0Brss HTTP/1.1" "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.94 Safari/537.36" - -
2016-05-24T03:33:37.334223Z 0.00003 0.001927 0.000021 200 200 0 5 "GET http://xxx.elb.amazonaws.com:80/socket.io/?EIO=3&transport=polling&t=LJWqpfN&sid=t4oUghKESf3iQDNIGEFx HTTP/1.1" "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.94 Safari/537.36" - -
2016-05-24T03:33:37.412382Z 0.000025 0.001156 0.000027 400 400 0 41 "GET http://xxx.elb.amazonaws.com:80/socket.io/?EIO=3&transport=websocket&sid=t4oUghKESf3iQDNIGEFx HTTP/1.1" "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.94 Safari/537.36" - -
2016-05-24T03:33:37.460320Z 0.000025 0.001016 0.000029 400 400 0 41 "GET http://xxx.elb.amazonaws.com:80/socket.io/?EIO=3&transport=polling&t=LJWqph5&sid=t4oUghKESf3iQDNIGEFx HTTP/1.1" "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.94 Safari/537.36" - -
2016-05-24T03:33:37.562313Z 0.000061 0.002397 0.000026 200 200 3 2 "POST http://xxx.elb.amazonaws.com:80/socket.io/?EIO=3&transport=polling&t=LJWqpj7&sid=t4oUghKESf3iQDNIGEFx HTTP/1.1" "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.94 Safari/537.36" - -
2016-05-24T03:33:37.878069Z 0.000057 0.001508 0.000019 200 200 0 101 "GET http://xxx.elb.amazonaws.com:80/socket.io/?EIO=3&transport=polling&t=LJWqqIm HTTP/1.1" "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.94 Safari/537.36" - -
2016-05-24T03:33:37.978133Z 0.000043 0.001061 0.000033 400 400 0 41 "GET http://xxx.elb.amazonaws.com:80/socket.io/?EIO=3&transport=polling&t=LJWqqKp&sid=az8li1OVGN8CuKc7Brst HTTP/1.1" "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.94 Safari/537.36" - -

服务器端代码是：

var http = require('http');
var koa = require('koa');
var app = koa();

app.use(router.routes())
   .use(router.allowedMethods());

router.get('/', getHomepage );
router.get('/:storeid', getHomepage );

app.context.render = render({
  root: path.join(__dirname, 'views'),
  autoescape: true,
  cache: 'memory', // disable, set to false
  ext: 'html',
//  locals: locals,
//  filters: filters,
//  tags: tags,
//  extensions: extensions
});

app.use(staticFolder('./public'));

var server = http.createServer(app.callback());
var io = require('socket.io')(server);
var storeId=0;

io.on('connection', function (socket)
{
    socket.on('submit', function(data)
    {
        // Do something
    }
));

在我拥有的客户端上：

<script type="text/javascript" src="socket.io/socket.io.js"></script>
<script type="text/javascript"> var socket = new io('http://xxx.elb.amazonaws.com'); </script>

【问题讨论】：

你没有使用 WebSockets。如果您使用的是 websockets，您将不会进行轮询。 WS 的重点是让您不必轮询。您的“WebSockets Library 1.4.x”没有使用 websockets。但是我们不知道您所说的“WebSockets Library 1.4.x”是什么意思。请提供有关如何设置“websockets”的更多信息。
看起来您的客户端正在使用 socket.io（不是普通的 webSocket），并且由于某种原因，您的客户端仅请求 polling 传输，而不是 webSocket 传输。请向我们展示建立连接的相关客户端代码。也可能是您的服务器库不支持 socket.io 连接。 socket.io 与 webSocket 不同。如果您从客户端（您是）请求 socket.io 连接，那么您必须在服务器上支持 socket.io 才能获得 webSocket 连接。
我正在使用“socket.io”：“1.4.x”，
您可以像这样在 socket.io 上强制使用真正的 websocket：var socket = io('http://xxx.elb.amazonaws.com', {transports: ['websocket']});。也不要使用new io，只使用io - socket.io 在他们的示例中不使用new。

标签： node.js websocket

【解决方案1】：

想通了。 Amazon ELB 不支持 WebSockets！！！

【讨论】：