How post / get requests to erpnext code without using frontend uring curl?

ERPNext
1

how post / get requests to erpnext code without using frontend uring curl?
and where icon fount requested urls?

2

Read this:

https://frappe.io/docs/user-guide/rest_api

3

404 error

4

https://frappe.io/help/rest_api

via

https://www.google.co.in/search?q=frappe+rest+api