What is the best / most popular / user friendly terminal http client I can replace postman with. Has a history I can search, save favorites, secure etc.

I like smaller more focused tools on the terminal. You can make these all work together pretty reasonably with a little glue. Hurl, mitmproxy, httpie with http-prompt. I tend to prefer mitmproxy sessions and massaging that with Python/curl as needed for repeating and tweaking. User friendly is relative, but these tools work well. Python for tweaking http streams in mitmproxy is powerful and rather friendly for what you get in return. Mitmproxy lets you easily save flows with a bit of Puthon glue to output httpie commands giving history, and you can save mitmproxy sessions.

I also have this question!

I starred Posting[1] but haven't yet got around to trying it.

[1]: https://news.ycombinator.com/item?id=40926211

Edit: here's another one: https://github.com/LucasPickering/slumber

Kulala nvim plugin or emacs rest client

xh has sessions. https://github.com/ducaale/xh

https://posting.sh/