apache/apisix

help request: plugins question that cant use grpc-transcode with ext-plugin-post-resp

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#10,787 opened on Jan 9, 2024

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Description

Description

I need use two plugins: grpc-transcode and ext-plugin-post-resp. There is no problem with these two plugins when used alone, but some problems occur when they are used together. When i use grpc-transcode and ext-plugin-post-resp together, the api response is :

{
    "code": 5,
    "message": "Not Found",
    "details": []
}

and some errors in apisix:

access_by_lua(nginx.conf:292):2: in main chunk xxx
/apisix/apisix/init.lua:730: in function 'http_access_phase'
[C]: in function 'handle_upstream'
coroutine 0:
stack traceback:
[error] 57#57: *872933 lua entry thread aborted: runtime error: /apisix/apisix/init.lua:730: attempt to call ngx.exec after sending out response headers

both plugins do their job correctly, upstream grpc service receive the request and returns right and ext-plugin-post-resp also print out logs after grpc service returns. I don't know how I should troubleshoot the problem next.

Environment

  • APISIX version : 3.6.0
  • Operating system : Ubuntu 16.04.1 LTS
  • OpenResty / Nginx version : nginx/1.20.1
  • etcd version, if relevant : 3.5.0

Contributor guide

Research direction
Examine the error trace to understand the conflicting behavior between grpc transcode and ext plugin post resp. Focus on why ngx.exec is called after response headers are sent, and investigate the plugin execution order and lifecycle hooks in APISIX.
Tech stack
lua
Domain
backendapi
Issue type
Bug
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.
Half day
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.
Mostly clear
Prerequisites
LuaAPISIX
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
45