Getting socket.io, express & node-http2 to communicate though HTTP/2

I wrote a Web Socket server using socket.io, node-http2 and express in Node.js. The server works as intended, except for the fact that according to Chrome's DevTools socket.io's negotiation requests go through HTTP/1.1 (shown below). The "Protocol" column should be displaying h2 if the request was sent using HTTP/2.

我在Node.js中使用socket.io，node-http2和express编写了一个Web Socket服务器。服务器按预期工作，除了根据Chrome的DevTools socket.io的协商请求通过HTTP / 1.1（如下所示）这一事实。如果请求是使用HTTP / 2发送的，则“协议”列应显示h2。

This only happens in Chrome, other browsers use the correct protocol.

这只发生在Chrome中，其他浏览器使用正确的协议。

The server code (shortened):

服务器代码（缩短）：

var PORT = 8667,
    config = require('./config'),
    socketioServer = require('socket.io'),
    app = express(),
    https = require('http2'),
    cors = require('cors');

app.use(cors(function(req, callback){
    var corsOptions = { origin: false };
    if (/^https:\/\/mlpvc-rr\.lc/.test(req.header('Origin')))
        corsOptions.origin = true;
    callback(null, corsOptions);
}));

app.get('/', function (req, res) {
  res.sendStatus(403);
});

var server = https.createServer({
    cert: fs.readFileSync(config.SSL_CERT),
    key: fs.readFileSync(config.SSL_KEY),
}, app);
server.listen(PORT);
var io = socketioServer.listen(server);
// ...

Browser connection code:

浏览器连接代码：

var conn = io('https://ws.'+location.hostname+':8667/', { reconnectionDelay: 5000 });
conn.on('connect', function(){
    console.log('[WS] Connected');
});
conn.on('disconnect',function(){
    console.log('[WS] Disconnected');
});

Output of testssl.sh:

testssl.sh的输出：

What do I need to change to make the socket.io requests go through HTTP/2?

我需要更改什么才能使socket.io请求通过HTTP / 2？

1 个解决方案

#1

As discussed in comments Chrome has recently stopped allowing the older NPN negotiation for HTTP/2 and insists on the newer ALPN protocol instead. See this article for more info: https://ma.ttias.be/day-google-chrome-disables-http2-nearly-everyone-may-31st-2016/

正如评论中所讨论的，Chrome最近已经停止允许HTTP / 2的旧NPN协商，而是坚持使用更新的ALPN协议。有关详细信息，请参阅此文章：https：//ma.ttias.be/day-google-chrome-disables-http2-nearly-everyone-may-31st-2016/

So you basically need Node.js to support ALPN which it looks as has only been added in v5 so far: https://github.com/nodejs/node/pull/2564 . An alternative would be to route your NodeJs calls through a webserver which is easier to upgrade OpenSSL (e.g. Nginx or Apache) to support HTTP/2 over ALPN.

所以你基本上需要Node.js来支持ALPN，它看起来只是到目前为止在v5中添加的：https：//github.com/nodejs/node/pull/2564。另一种方法是通过Web服务器路由您的NodeJs调用，这更容易升级OpenSSL（例如Nginx或Apache）以支持ALPN上的HTTP / 2。

You confirmed this was the issue by using the testssl.sh program which confirmed no ALPN support and the fact Firefox uses HTTP/2.

您通过使用testssl.sh程序确认这是问题，该程序确认没有ALPN支持以及Firefox使用HTTP / 2的事实。