Hangs when trying to add API or test existing API

[robintw]

I've just installed this extension to try and test it with my new STAC API, and I've found it seems to keep hanging whenever it tries to make a network request.

If I go to Configure APIs, and try and add my new API, it hangs when testing the API. Similarly, it hangs whenever testing any of the APIs that are originally listed there.

Do you know if there is some major network access problem with this plugin?