Building a transparent proxy for websockets connections

[Ángel Nohara]

Hi all,

First of all, thanks for the all the work behind the Gorilla websockets project. I just discovered it and looks really nice.

Here it goes my question, I want to build a proxy for the whole websocket communication (including the protocol upgrade by HTTP). I have an application that communicates using websockets. The messages are sent using an specific binary format, so in my code I want to do the following process:

1. Handle the connection process in HTTP, verifying the headers sent in the first HTTP connection.
2. For every subsequent websocket message, parse the binary structure (I already have a function for parsing it), modify a string value and send it to the original destination in the binary format again.

I'm a bit lost in how to just intercept the websocket connection and access to the binary data.

[Matt S]

Take a look at https://github.com/gorilla/websocket/tree/master/examples/chat (and the other examples) - gorilla/websocket handles upgrading of the connection for you.

Parsing and then connecting to an upstream server can be done with the client APIs in the library.

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