Fix unit tests

[Greybird]

Description

Fix unit tests that are not passing anymore, as https://api.ipify.org/ does not support POST calls anymore.

Testing

The change is only on testing code, and makes failing tests pass.

Pull Request Type

Please select the option(s) that are relevant to this PR.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Improvement (fixing a typo, updating readme, renaming a variable name, etc)

[nwithan8]

Hey there! Thanks so much for your contribution and for catching this!

Code looks good. I was going to suggest using HTTPBin, but seems like you're one step ahead of me.

(TIL about Postman Echo. Also TIL HTTPBin was developed by Postman and hasn't been updated in years... which means it's probably going away soon...).

There's an issue with our CI right now that's causing the checks to fail. We're going to fix that right now, and then after a rebase, this should be good to approve and merge!

Thanks again!