Node.js: HTTP Fakr
Alex Holt
A simple node.js proxy server
Basic Node.js proxy server that will pass all HTTP traffic through.
In the overrides/ directory you can place simple files that you want to override, the proxy will then return these to the browser without requesting from the server. Allowing you to inject different content into your browser locally.
This has all manner of interesting applications, but i'll leave it to you to work out what you could use it for.