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A regular request we receive is to support the modification of html/xml content that is returned in the response from an upstream server.
[Harmon](https://github.com/No9/harmon/) is a stream based middleware plugin that is designed to solve that problem in the most effective way possible.
## Proxying WebSockets
Websockets are handled automatically when using `httpProxy.createServer()`, but if you want to use it in conjunction with a stand-alone HTTP + WebSocket (such as [socket.io][5]) server here's how: