[Privoxy-users] WebSocket in Privoxy

[Fabian Keil]

Marek Küthe <m-k-mailling-list at mk16.de> wrote on 2023-03-20 at 21:48:11:

> I am trying to use a web application which uses WebSockets. As a
> browser I use Firefox ESR. Privoxy is running locally on my computer
> and Firefox is set to send requests to Privoxy. Now I have tried
> something around and found that the web application works without
> problems if no proxy is configured. When Privoxy is configured, it
> stops at `Connection is being established.`. Then after some time the
> web application sometimes reports WebSocket error `1006` (no error
> text). The web application does not use HTTPS / TLS and therefore
> `ws://` and not `wss://`. Firefox itself outputs `Firefox cannot
> connect to the server at ws://lg.reseau.mk16.de/ws.` in the developer
> console.
> 
> Is this due to Privoxy? If yes, is there a workaround? Is it possible
> to forward WebSocket connections one-to-one or similar?
> 
> I hope I am right here at the Mailling list. I would be glad about an
> answer!

Which Privoxy version do you use?

Please provide a log excerpt created with the debug settings
listed at [0] that shows the problems.

To create a WebSocket through Privoxy, Firefox should use
a CONNECT request to open a tunnel. If Privoxy isn't configured
to block or intercept this, this is expected to work.

We currently have not tests for WebSockets, though, so it's
conceivable that there is a regression.

Fabian

[0] <https://www.privoxy.org/user-manual/contact.html>
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