alt Hacker NewsRequest hedging or backup requests are indeed the terms I know for requests where you give the first request a bit of a headstart. I didn’t know about the term happy eyeball to signify that all requests fire at the same time.
Request hedging or backup requests are indeed the terms I know for requests where you give the first request a bit of a headstart. I didn’t know about the term happy eyeball to signify that all requests fire at the same time.
> I didn’t know about the term happy eyeball to signify that all requests fire at the same time.
It's not quite the same. Usually with Happy Eyeballs, you want to try multiple protocols (e.g. QUIC vs TCP, or IPv6 vs IPv4), and you have a preference for one over the other. As such, you try to establish your connection via IPv6, wait something like 30ms, then try to establish via IPv4. Whichever mechanism completes channel setup first wins, and you can cancel the other one.
It's a mechanism used to drive adoption of newer protocols while limiting the impact on end users.