UnityWebRequest ConnectionError in 2021 LTS but not 2020 LTS, WebGL

Unity Engine
,
1

I’m running into a weird issue, where I call UnityWebRequest, and it succeeds in 2020 LTS, but not in 2021 LTS. This is on a WebGL build. In the Unity Editor, it works fine. I’m calling the exact same url under both versions. In 2021 LTS, I get result ConnectionError.

The server is a .NET 6.0 console application.

Anyone have any ideas where I can look into this more? Or is there a known issue with 2021 LTS WebGL builds?

2

Always the device / runtime / browser logs, obviously.

Networking, UnityWebRequest, WWW, Postman, curl, WebAPI, etc:

https://discussions.unity.com/t/831681/2

https://discussions.unity.com/t/837672/2

And setting up a proxy can be very helpful too, in order to compare traffic:

https://support.unity.com/hc/en-us/articles/115002917683-Using-Charles-Proxy-with-Unity

3

Ah, I can always count on Kurt-Dekker’s copy and paste response to be at the ready. If it weren’t so helpful, I would otherwise find it annoying.

4

Thanks, I try. I am always amending my copy/pasta stuff, plus often it gets hand-modified as I post it for a particular answer.

I am always open to suggestions for how to make it more useful, so don’t be shy if you have ideas!

5

This is actually exactly what’s happening with my build. Has anyone else experienced this problem?