Support request: Help wanted for custom Spring function

[Marx2]

My actions before raising this issue

• Followed the troubleshooting guide
• Read/searched the docs
• Searched past issues

I'm trying to call java function and it doesn't work

Who is this for?

personal project

When Function is called, exception happens. Possible fix, described in documentation, has no description, how to apply

Current Behaviour

I'm calling function https://hub.docker.com/r/marx2/spring-cloud-fn/tags (source code: https://github.com/Marx2/spring-cloud-function-openfaas)
Instead of output I'm receiving:
2023/04/23 22:07:47 Upstream HTTP request error: Post "http://127.0.0.1:8082/": net/http: HTTP/1.x transport connection broken: too many transfer encodings: ["chunked" "chunked"]
It should simply call a function and give back a reversed string

Are you a GitHub Sponsor (Yes/No?)

Check at: https://github.com/sponsors/openfaas

• Yes
• No

List All Possible Solutions and Workarounds

1. It's said that problem can be fixed by setting:
   http_buffer_req_body: true
   but there's no mention, how to do that.
   Solution would be to update documentation with clear description, where and how to set this value.
   https://docs.openfaas.com/deployment/troubleshooting/#my-function-gets-a-nil-or-empty-body
2. Second possible solution is to upgrade/reconfigure Go library, to accept duplicated headers

Which Solution Do You Recommend?

Steps to Reproduce (for bugs)

1. Deploy given function: https://hub.docker.com/r/marx2/spring-cloud-fn/tags
2. Call it and watch function container logs
3. Function returns error 500
4. In logs there's an error:
   2023/04/23 22:39:19 Upstream HTTP request error: Post "http://127.0.0.1:8082/": net/http: HTTP/1.x transport connection broken: too many transfer encodings: ["chunked" "chunked"]

Context

I've read that this error is caused by new Go library, which has implemented strict checking of duplicated headers.

Your Environment

• FaaS-CLI version ( Full output from: faas-cli version ):
  CLI:
  commit: 0b1e92baf1377cc64c89b131fb3b227105f115da
  version: 0.16.3

Gateway
uri: https://openfaas.k.marx.katowice.pl
version: 0.26.3
sha: a128df4

Provider
name: faas-netes-ce
orchestration: kubernetes
version: 0.16.7
sha: e53a5fffb5d96d6e657ad4ff50c1b8bd009fab67

• Docker version docker version (e.g. Docker 17.0.05 ):
  Client:
  Version: 20.10.21-rd
  API version: 1.41
  Go version: go1.18.7
  Git commit: ac29474
  Built: Tue Nov 22 22:21:43 2022
  OS/Arch: darwin/arm64
  Context: default
  Experimental: true

Server: Docker Desktop 4.15.0 (93002)
Engine:
Version: 20.10.21
API version: 1.41 (minimum version 1.12)
Go version: go1.18.7
Git commit: 3056208
Built: Tue Oct 25 17:59:41 2022
OS/Arch: linux/arm64
Experimental: true
containerd:
Version: 1.6.10
GitCommit: 770bd0108c32f3fb5c73ae1264f7e503fe7b2661
runc:
Version: 1.1.4
GitCommit: v1.1.4-0-g5fd4c4d
docker-init:
Version: 0.19.0
GitCommit: de40ad0

• Are you using OpenFaaS on Kubernetes or faasd?
  Kubernetes
• Operating System and version (e.g. Linux, Windows, MacOS):
  build env: MacOS
• Code example or link to GitHub repo or gist to reproduce problem:
  https://github.com/Marx2/spring-cloud-function-openfaas
• Other diagnostic information / logs from troubleshooting guide

[PySualk]

Would be interested in a solution as well.

[alexellis]

Hi @Marx2 & @PySualk - I assume you both work together then?

This isn't an error that we've found with any of our supported templates or even heard of before from other users.

I can see that you've built a Dockerfile-based function, I would recommend creating your own template and then using that for your function instead.

The chances are that you have a bug in your custom Spring template or have misconfigured it.

transport connection broken: too many transfer encodings: ["chunked" "chunked"]

Do you know why is your function returning the same header twice? Is this a bug in Spring?

We have a template for Vert.x that also uses Gradle, perhaps you'd prefer that?

https://www.openfaas.com/blog/get-started-with-java-openjdk11/

Alex

[alexellis]

/set title: Support request: Help wanted for custom Spring function

[alexellis]

From looking into the top answers on Google - it seems like this may be a well-known bug with Spring

https://community.pivotal.io/s/article/Application-Chunked-Error?language=en_US
https://developer.salesforce.com/forums/?id=906F00000008mDUIAY
spring-projects/spring-framework#21523
https://stackoverflow.com/questions/73198081/spring-boot-web-how-to-remove-chunked-transfer-encoding-in-the-response-header

If you don't want to use Vert.x and have suggestions, we'll consider them.

[alexellis]

Hi @Marx2 I commented and gave you direction two weeks ago.

Since I haven't heard from you I'm going to close this issue and assume you found a way forward.

Feel free to keep the discussion going if you need to.

Alex