What does this error indicate?

[agrajag (Todd Grayson)]

You might want to check out the keepalive directive as well for the reverse proxy config? Check out this discussion:

Mqtt/tcp keepalive when proxying websocket

No, this is a great way to do it. Simplifies a bunch of stuff client-side IMO (for general WS, in my experience, can’t comment on MQTT cause I don’t use it). There’s some keepalive options you can play with in the reverse_proxy's HTTP transport: I’ve never needed to play around with changing keepalives, so I don’t have any specific recommendations there. But this is for the connection between Caddy and your upstream. This thread mentions this was added to ListenConfig, which seems like a…