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VisualizaçõesExpress http 2 server push
I've made a small server to try http2 on node, however I can't tell if the push mechanism is working or not. My style is loaded over http2 but that does not mean that push is working as intended...
const port = 3000
const spdy = require('spdy')
const express = require('express')
const path = require('path')
const fs = require('fs')
const app = express()
app.get('*', (req, res) => {
res.set('Link', '</css/styles.css>; rel=preload; as=style');
res.sendFile(__dirname + '/index.html')
})
const options = {
key: fs.readFileSync(__dirname + '/keys/server.key'),
cert: fs.readFileSync(__dirname + '/keys/server.crt')
}
spdy.createServer(options, app).listen(3000);
In the devtools, the initiator says : "other".
2 Respostas
Responde à pergunta0
You need to explicitly tell your express server which resources to push. Look here for a decent run through of it:
https://webapplog.com/http2-server-push-node-express/
An example route from that page:
app.get('/pushy', (req, res) => {
var stream = res.push('/main.js', {
status: 200, // optional
method: 'GET', // optional
request: {
accept: '*/*'
},
response: {
'content-type': 'application/javascript'
}
})
stream.on('error', function() {
})
stream.end('alert("hello from push stream!");')
res.end('<script src="/main.js"></script>')
})
Calling res.push() is the key here with the file you want to serve.
He also documents a way to write some middleware to handle pushing as well of assets:
https://webapplog.com/http2-server-push-express-middleware/
Once you have this implemented you can see the pushed items in Chrome devtools as in the answer from BazzaDP.
0
Chrome will show "Push / Other" in the Initiator column in Developer Tools->Network if the asset is pushed from the server:
I don't use the SDPY module in Node, but looks like from here and here that this module doesn't use the Link header to push resources like some other servers (e.g. Apache) do. So unless you have, for example, Apache in front of this in HTTP/2 mode then I doubt your code will push the resource.