How to modify HTTP responses in a different .NET process

Question

I have a standard web server that serve web pages.

I want to monitor traffic on port 80, intercept every http responses, and add/inject an additionnal header to them.

The process will then act like a proxy between the web server and the client.

Could you please give me some pointers? I'm already aware of SharpPCap, but I'm not sure where to start.

Note: I can't rely on the web server, I can't control it or change it's configuration. However I can install any other process on the same machine.

Thanks a million

Answer 1

I think what you want to do can be done with IIS 7.0 URL Rewrite module instead of rolling your own code.

http://learn.iis.net/page.aspx/711/modifying-http-response-headers/

Answer 2

I think that SharpPCap is an overkill here.

Try:

• listen on a port (say 8080)
• for each incoming connection, accept and open one to the server (original one, port 80)
• pass everything that comes in from the client straight to the server
• pass everything that comes from the server back to the client, monitoring the stream and injecting/modifying if needed