oauth2.googleapis.com API request is not going through proxy

[vineshraja]

We are using FireBaseSDK(firebase-admin-9.2.0) to push notifications, while testing we noted below.

-- Request going through proxy
POST https://fcm.googleapis.com/v1/projects/

--Request not going through proxy
POST https://oauth2.googleapis.com/token

Kindly let us know why oauth2 request is not going through proxy.

[google-oss-bot]

I couldn't figure out how to label this issue, so I've labeled it for a human to triage. Hang tight.

[LucasJC]

hi! I may have the same issue, has anyone found out how to fix it?

EDIT: nevermind! Just found out in my case at least it was a misconfiguration:
I had this line when setting up the HttpAsyncClientBuilder:
.setRoutePlanner(new SystemDefaultRoutePlanner(ProxySelector.getDefault()))

This ended up with a wrong route planner configuration. I removed this line and it started to work!