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Support HTTP trailers

See original GitHub issue

We currently do not support HTTP/1.x or HTTP/2.0 trailers. HTTP trailers are basically additional headers sent after the body. https://discourse.mitmproxy.org/t/http-2-trailers-not-supported/557/2 mentions that gRPC is doing this, so this seems like a reasonable feature we should support. I think the rough implementation plan looks as follows:

Add HTTPFlow.trailers attribute (which is a http.Headers instance or None)
Modify HTTP/2.0 layer to support trailers. This is likely the most difficult part.
Expose trailers in mitmdump (#4213)
Expose trailers in mitmproxy
Expose trailers in mitmweb
Wait if anyone ever requests HTTP/1.0 trailer support.

Issue Analytics

State:
Created 6 years ago
Reactions:11
Comments:8 (5 by maintainers)

Top GitHub Comments

2reactions

easyhutucommented, Nov 9, 2019

Dear developer, is there any plan to support HTTP trailers? I also encountered this problem when trying to intercept grpc, very much hope that the development team solves this problem.

0reactions

mhilscommented, Aug 23, 2021

Yes - we’ve just merged our new proxy core, which currently does not support trailers yet. I’m sorry about the regression, but the benefits in other areas clearly outweigh this and we need to ship at some point. If anyone wants to give this a stab again, I’d be happy to help!

The new proxy core now also handles trailers. 😃