Is it possible to intercept http requests and modify the data (eg replace content using regex) before it renders in the browser? If so, how?
c, c++, network-programming
Solution
What you're describing is called a "transparent proxy". (Assuming that you aren't modifying the browser). You'll generally need some help from the OS to get in between the browser and the network, or you need to implement the proxy in a separate router. In linux this can be accomplished with iptables. I imagine windows has a similar feature.
Problem
Today I stumbled upon Wireshark which is capable of intercepting all the network traffic on your PC. I was wondering if it is possible to modify data after a request (so the data that is sent back to the PC) and modify it using regex? Like replace words and patterns in the data before it is rendered in the browser? (Example: replace the word mad with happy or replace a whole website with "Stop procrastinating") If this is possible: - How should I implement it? What functions will be essential? - Are there any open source libraries that will help me accomplish this? - Are there any prior reading I should do before implementing this? Note that the platform for this will be Windows and I'll try and do this in C++