How to examine api without documentation?

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I have to use an API for my android app without any documentation. Before in my work I always had documentation, so this is a new situation for me. Backend developers said their api supports option requests. How to send option request? Using browser or what? And how to find out what I should put in POST requests' bodies? Thanks for your help in advance!

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You can issue an OPTIONS request (which is an HTTP method like GET or POST) like so with, say, curl:

curl -X OPTIONS http://example.org -i

or Postman.

However, OPTIONS is designed only to reply with the methods a particular endpoint accepts: I can do GET and POST. It would be rather irregular for it to respond with an expected data structure, but nothing is impossible.