www is being added to API endpoint

[ay0o]

Describe the bug When I try to configure a runner with a registration token generated with either a GitHub App or a PAT, a www is added to the middle of the endpoint. Instead of api.github.com, it becomes api.www.github.com.

However, if I use the token generated by GitHub when manually going to a repo and hitting the New self-hosted runner button, it works.

To make things more weird, if we ignore the configuration and just run the run.sh --check, the same happens.

For example:

2025-02-07T11:03:22.6743857Z ***************************************************************************************************************
2025-02-07T11:03:22.6743878Z ****                                                                                                       ****
2025-02-07T11:03:22.6743881Z ****     Try DNS lookup for api.www.github.com
2025-02-07T11:03:22.6743893Z ****                                                                                                       ****
2025-02-07T11:03:22.6743897Z ***************************************************************************************************************
2025-02-07T11:03:22.6796296Z ***************************************************************************************************************
2025-02-07T11:03:22.6796319Z ****                                                                                                       ****
2025-02-07T11:03:22.6796338Z ****     Resolved DNS for api.www.github.com failed with error: System.Net.Sockets.SocketException (00000005, 0xFFFDFFFF): Name or service not known

I have tried both Ubuntu and Amazon Linux

To Reproduce

1. Launch an EC2
2. Download the runner software
3. Run the checker. ./run.sh --check --url ... --pat ...

Expected behavior Correct endpoints used

Runner Version and Platform

2.322.0

Amazon Linux and Ubuntu 24.04

[ay0o]

oh, found the root cause for this.

It's because I was using as URL https://www.github.com/owner/repo.

I would say this is not ok. If the tool expects to connect to api.github.com, it shouldn't matter whether the URL is passed as either github.com or www.github.com, don't you think?

[lemisieur]

Technically the GitHub Self-Hosted runners can also be used with a self-hosted instance of GitHub (GitHub Enterprise), which likely will end up having a completely different FQDN. I think this is a clever way to try to find the API endpoint.