http2 support

[budarin]

http2 is out in node 10.0.0.
will http 2 be supported by the library?

[likegun]

@budarin You can use require('http2').createSecureServer(cert, new Koa().callback()).listen() to use http2 which answered by fl0w in this issue

[budarin]

I am not about creating and starting the server - it is simple, I am about pushing resources, methods signatures and so

[cupcakearmy]

While

require('http2').createSecureServer(cert, new Koa().callback()).listen()

is really neat and simple, I believe that something along the lines of

new Koa({
    http2: {
        cert: ...,
        key: ...,
        enabled: true | false    // Optional for debugging
    }
})

could be very helpful and really not a big addition in terms of codebase and complexity.

It's the same reason why we don't use

require('http').createServer(new Koa().callback()).listen()

Any thoughts on the matter?

[fl0w]

@cupcakearmy That proposal was turned down in #1063, I added a summary in this comment

[budarin]

if I have to use callback syntax - then why do I need koa ???

[fl0w]

@budarin Because that's the design of http. Koa's essentially just a "sugarized" requestListener.

[budarin]

I am about somthing like a push method in express ...
Using http2 like a usual https - what is a profit?

[fl0w]

@budarin Nobody said not to expand Koa support for HTTP/2, let's wait and see what happens.

[budarin]

what year can we see it? :)
and one more question: will it be using compatibility API like it does at now or will use native HTTP/2 stream API?

[alexander-akait]

We think about migration from express to koa in webpack-dev-server, it is only one blocker for us, can't find documentation how koa works with http2 and examples

[wood1986]

Hey @evilebottnawi, FYI I can get koa work with http2. This is the code that I am using

const http = require('http');
const http2 = require('http2');
const Koa = require('koa');
const app = new Koa();

// response
app.use(ctx => {
  ctx.body = 'Hello Koa';
});

http.createServer(app.callback()).listen(80);

http2.createSecureServer({
  "key": certificate,
  "cert": certificate
}, app.callback()).listen(443);

[jonathanong]

i've looked at this a long time ago, and adding push support was complicated and did not provide much benefit. koa would basically just set headers in the stream, but you'd still need to pipe data to the stream yourself.

this might be better as a framework using koa than supported in koa itself

let us know if you have any API recommendations

[niftylettuce]

HTTP/2 already works with Koa.

See https://github.com/ladjs/web/blob/master/index.js for an example (note the lines are currently commented out because there is a core bug in Node with HTTP/2 XHR requests; they do not work). See https://www.theregister.com/2020/08/18/nodejs_chromium_patch/.

Ref: nodejs/node#33875 and <https://bugs.chromium.org/p/chromium/issues/detail?id=1045328#c46