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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.