akka/akka-http

Add support for Websockets over HTTP/2 / RFC 8441 on client-side

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#3,710 opened on Dec 17, 2020

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1 - triagedhelp wantednice-to-have (low-prio)t:clientt:coret:http2t:websocket

Description

Server-side #3709

Probably harder to do than on server-side because we currently don't have any API to reuse an existing connection for WebSocket usage. Instead, for HTTP/1.1 we have some fixed logic that allows to create connections just for the use of WebSocket without any dynamic protocol dispatching logic.

Also, the problem is that the user does not know that a given HTTP/2 connection would support WebSocket, so some trial and error would be needed to figure that out.

Contributor guide

Tech stack
None
Domain
backend
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
5
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
over 1 week
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
HTTP/2 and WebSocket protocolsAkka HTTP client internalsScala programming
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
10
Research direction
Start by reviewing the existing server side support for WebSocket over HTTP/2 (issue #3709) and the client side HTTP/1.1 WebSocket connection logic. Investigate how the current client handles HTTP/2 connections and explore the possibility of adding a trial and error mechanism to detect server support for RFC 8441. Consider how to reuse an existing HTTP/2 connection for WebSocket usage without breaking other requests.
Add support for Websockets over HTTP/2 / RFC 8441 on client-side · akka/akka-http#3710 | Good First Issue