Tvheadend

Currently if you connect two tvheadend instances together by using a bunch of HTTP muxes, whenever you restart the "client" it will perform the initial EPG grab (unless you've disabled that). On the server side this looks like any other subscription and thus gets a standard priority, when it really should be detected as an EPG grab subscription.

I suggest tvheadend sends an additional GET parameter for HTTP requests (perhaps something prefixed so that non-tvheadend servers don't accidentally react on it), and when a HTTP stream request comes in the parameter is checked and the subscription priority is set accordingly.