A better url might be https://hurl.dev/

Hurl runs super fast without startup latency unlike a lot of tools in this category written in node. The plain text format can be checked in and this can be part of your CI process. Hurl can capture data from previous requests to run workflows and serve as a testing tool. The main downside is the lack of a GUI, although I imagine it being not that hard to do something like make a plugin for VSCode that will add a run button to the text file and display the result in the editor.