envoyproxy/envoy

Applying L7 filters after TCP tunneling

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#24,724 opened on Jan 2, 2023

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area/http_filterenhancementhelp wanted

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Description

I am upgrading a TCP stream to HTTP/2 using the TCP tunneling feature. Is there any way to support applying a L7 filter to the output of the tunneling, without creating another listener? Currently it seems like the only way to do this, is routing the output of the first listener (that has the tcp_proxy filter) to a second listener where there's the HTTP connection manager filter.

Contributor guide

Research direction
Investigate the Envoy codebase to determine if L7 filters can be applied after TCP tunneling without creating a second listener. Examine the tcp proxy and http connection manager filters and their integration. If not possible, draft a proposal for adding this capability.
Tech stack
cpp
Domain
backend
Issue type
Research
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Envoynetworking
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40