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leehampton | 5 years ago

I love HA Proxy, but one thing I'm confused about is why the http-tunnel feature was removed in this release (and deprecated in earlier 2.x releases). http-tunnel allowed you to start a session with an HTTP request/response, then keep the socket to the backend alive without further inspection of the protocol.

This is useful for things like RTSP where you kick things off with HTTP but then stream lower level TCP content over the same socket. There are also lots of other custom protocols that benefit from this type of set up, including one that I'm working on wrangling HA Proxy to work with now.

Does anyone know if there's some replacement way to handle this in HA Proxy that I'm overlooking?

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thayne|5 years ago

> why the http-tunnel feature was removed in this release

From the haproxy 2.0 documentation:

> This mode should not be used as it creates lots of trouble with logging and HTTP processing. And because it cannot work in HTTP/2, this option is deprecated and it is only supported on legacy HTTP frontends. In HTX, it is ignored and a warning is emitted during HAProxy startup.

As for a way to handle this, I believe if you are using an HTTP CONNECT or a websocket (Connection: Upgrade), then haproxy will detect that it is a tunnel, and handle that correctly. If that's not the case, you might be able to use haproxy in tcp mode.