How to change responses from the server?

Question

Burglary protection

Good afternoon,
Today the question arose of hacking the client side of the testing system.
Quickly found a bunch of interesting bugs.
Now I would like to try to replace a couple of responses from the server directly on the client machine. Intuition suggests that all this is done through sockets (although it is possible in some other way).
Alas, I am not familiar with the methods and programs for such things.
What software is better to use? (Machine without root and included Kaspersky).

Answer 1

If the question interests you from a testing point of view, i.e. local emulation of Main-in-the-middle, then Fiddler should be fine, it, among other numerous features, can replace certain answers.

Answer 2

In short, this type of attack is called Man-in-the-middle (MITM). Implementation methods depend on where you can reach and consists in proxying traffic between the server and the client and redirecting it to your server / host. The easiest way is to change dns (for example, in the hosts file on XP)

Answer 3

Raise a local web server and "intercept" the domain via hosts.