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

This is one of many reasons why I prefer curl[0] and a bit of shell scripting. With this approach there is no dependency on a vendor's servers.

0 - https://curl.se/docs/manpage.html

Same but since a lot of bigger scenarios I need to test the scripting quickly becomes a lot so I often do this using Groovy (as I am a Java developer this is nearly the same). I now have a collection of scripts I often reuse and adapt.