What is it?
node-filterproxy is a filtering and streaming HTTP proxy. It can:
- block requests by server hostname
- block requests by URL
- inject things in pages when URL and content match (works without completely buffering the response!)
Injection works this way: Whenever a response comes in and its URL matches a configured injection, the response stream will be watched in order to find the trigger byte sequence. Upon finding such a trigger sequence, a predefined other byte sequence will be injected in the stream.