I have a program that activate an chip for racing results. (Its just a piece of hardware).
I watch with Fiddler (Sniffing program) the in and outgoing traffic from my pc when I connect the chip with my computer.
The program sends the following HTTP Request:
POST http://example.com/index.php HTTP/1.1
Accept: */*
Accept-Encoding: gzip, deflate
Connection: Keep-Alive
Content-Length: 185
Content-Type: application/x-www-form-urlencoded
Host: example.com
Pragma: no-cache
User-Agent: SomeProgram 1.2.3
Data==%0D%0AAjlFNEEw-SOMELONGSECRETKEY-RGAw%3D%3D%0D%0A
I receive the following response:
<?xml version="1.0" encoding="utf-8"?>
<message type="3" result="1" txid="someid" activationdate="" availablecredits="732" firstname="John" lastname="Doe" email="JohnDoe@outlook.com" phonenumber="00123445" notification_email="1" notification_text="1"/>
Is it possible to edit the response so that when the programs check for the availablecredits variable, he get the value 9999 instead of 732.
Im working on a Windows 8 laptop.
Definitely - Fiddler allows you to modify requests and responses by adding rules to FiddlerScript. Citing Fiddler documentation:
To make custom changes to web requests and responses, use FiddlerScript to add rules to Fiddler's OnBeforeRequest or OnBeforeResponse function. Which function is appropriate depends on the objects your code uses: OnBeforeRequest is called before each request, and OnBeforeResponse is called before each response.
So, all you have to do is to add to OnBeforeResponse the logic for replacing the availablecredits attribute value with any value you desire.