How to fix a 404 error when correctly sending a POST request to a web service?

Question

PHP

Good morning!
I recently wrote and tested the web service code that is responsible for sending data from the callback order form, interacting with the landing page. When I tested the service in Postman using this POST request:

phone=89012345678

And generating a response in JSON format, the service returned a 404 error:

{
    "result": "Not found"
}

Questions:

1. The algorithm itself was written without errors, and why is this happening (if it should issue the 200th HTTP status)?
   
2. What did I do wrong?
   
3. How can I make sure that without a 404 error, the POST request is sent normally?
   

Thank you in advance for your help!

Answer 1

Show your vangi request on vacation.