Using 5.22.0 HTTP/2 Beta breaks when scripting enabled

[charlesdurham]

Description

Enabling scripting with the HTTP/2 beta remaps requests into HTTP/1.1

Steps to Reproduce

1. Install the HTTP/2 Beta.
2. Write an empty script that just forwards along request/response
3. See HTTP/1.1 mappings
4. This causes the returned responses to to be incorrect. I see errors like this on my client "Received unexpected EOS on empty DATA frame from server".
5. Note -- I'm also using gRPC

Current Behavior

HTTP/2 Beta does not support scripting.

Expected Behavior

Enabling a "default" script should not break HTTP/2.

Environment

• App version: Proxyman 5.22.0 (HTTP/2 beta)
• macOS 15.5

[charlesdurham]

Sort of cross-posted in the discord server:

https://discord.com/channels/1288408051367546961/1288417717124075571/1393645039791505488

[charlesdurham]

This only happens if I override onResponse. Overriding onRequest works fine.

[NghiaTranUIT]

Thanks for the report. I will investigate it this week 👍

[NghiaTranUIT]

@charlesdurham I tested and it works fine. Here is me setup

1. Setup a Empty script (Enable the On Request and On Response) for httpbin.org
2. Make a request curl --http2 -v "https://httpbin.org/get?id=123" --proxy localhost:9090
3. Observe the Response and Script Log
4. It works fine

I guess it doesn't work with your case because youre' gRPC that Proxyman doesn't really support it

[charlesdurham]

Thanks for the quick response. Is this something you want to keep exploring? I do agree it's likely some combination of gRPC. I don't have time right now (can probably by EOW) but if you're willing to take another look I can share some screenshots of what I was seeing, just didn't initially since I was too lazy to hide any company internal details.

[NghiaTranUIT]

@charlesdurham can you elaborate on it?

Does it mean:

### Known issue
Proxyman doesn't fetch the HTTP Frame Setting from the client -> It uses a default frame setting (Same Settings with Google)

May I ask why default HTTP Settings frame can break it?

[charlesdurham]

That was a shot in the dark. Let me get some more useful logs / examples this week and get back to you.