Where can I find sites or servers for testing Rest api requests?

Question

Android

I'm trying to create mobile applications and while studying Rest api I ran into the problem of testing and processing rest api requests. Servers are needed, with simple authorization with obtaining a token and subsequent transition to Oauth2.0 authentication, to test requests and process them. I found a solution with json-server, but due to ignorance of js, I could only use an example. Tell me some sites or servers with simple authorization, for testing, having mastered which you could switch to Oauth2.0.

Answer 1

firebase

Answer 2

Expand your server.
For a very simple and no-hassle solution, I can recommend sparkjava.com