one of our esteemed client had requirement to developed functionality to post upload file to third party software using URL rewriting.This was most tedious task to post files using HTTP where we have to interpret internal process of third-party application. this is the one kind of hacking tactics. we use fiddler to track the posted data.
We also use sharp tools to using HTTP proxy to interpret request of the application.
We will share you short of the code soon for you to crack this kind of problem.
Happy programming !!!