Why is the response to a similar request empty?

1

Imagine:
There is an online game that sends a request to the server (client.рһр) with two constants and one random number, the server returns the result, and then the game uses it.

BUT!
If I send a similar request, but manually
Or even more difficult:
> stop the script before sending the request
> copy the request data
> send the same request, but manually

THEN RESPONSE IN BOTH CASES WILL BE EMPTY
WHY!?
Anyone help me please

2

You need to show us the code in order to understand. Do not show us the whole thing, only the necessary methods that are being called