Postman which I thought worked locally on my computer, is down

Depending on your usage, you may not need a separate app. Jetbrains[0], Visual Studio[1] and VSCode[2] have support for http files.

[0]: https://www.jetbrains.com/help/idea/http-client-in-product-c...

[1]: https://learn.microsoft.com/en-us/aspnet/core/test/http-file...

[2]: https://marketplace.visualstudio.com/items?itemName=humao.re...