How to read and change HTTP traffic on-the-fly on Windows?

I need a method that would allow me to read all the HTTP traffic on a local machine, and to chan开发者_运维技巧ge this traffic on-the-fly. Basically, I need to change the content on any web page opened in any browser at the machine.

Any thoughts?

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For debugging/troubleshooting, or in production?

For debugging. fiddler2 lets you do this with scripts

For production use, you probably want to implement a Layered Service Provider (which I assume Fiddler2 does)

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Thought: Don't do it.

If you need this for corporate environment, use mandatory proxy with some URL scanning and redirection.

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You can run Privoxy locally as a proxy server, and define your content or URL rewrite rules it in.