Client.close() does not wait for requests to finish in HTTP2 mode

[matthieusieben]

Bug Description

Dispatcher.close() is documented as:

Closes the client and gracefully waits for enqueued requests to complete before invoking the callback (or returning a promise if no callback is provided).

However, when using HTTP2 mode, the requests are terminated before the pending requests complete.

Reproducible By

import { Client } from 'undici'

const url = new URL('https://identity.foundation/.well-known/did.json')

const dispatcher = new Client(url.origin, {
  allowH2: true, // <=== "true" here causes an error. "false" doesn't
})

const res = await globalThis.fetch(url, { dispatcher })

dispatcher.close().then(
  () => {
    console.info('closed')
  },
  (err) => {
    console.error('failed closing', err)
  },
)

await res.json()
/**
 * TypeError: terminated
 *       at Request.onError (node_modules/.pnpm/undici@6.19.8/node_modules/undici/lib/core/request.js:299:27)
 *       at Object.errorRequest (node_modules/.pnpm/undici@6.19.8/node_modules/undici/lib/core/util.js:638:13)
 *       at abort (node_modules/.pnpm/undici@6.19.8/node_modules/undici/lib/dispatcher/client-h2.js:277:10)
 *       at ClientHttp2Stream.<anonymous> (node_modules/.pnpm/undici@6.19.8/node_modules/undici/lib/dispatcher/client-h2.js:452:5)
 */

Expected Behavior

Same behavior as when allowH2: false: no error & client can be closed before completing.

Logs & Screenshots

Environment

Node: v18.20.4
Undici: 6.19.8

[metcoder95]

The issue roots to the fact that H2 is half connected to the queueing system of undici. Working on connecting the H2 part now.