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I like the idea. I guess you could do something with pubsub to simulate this model. A regular http stack (load balancer and reverse proxies in front of some http framework) would probably need major modifications to work.

It would be great if such a mechanism was part of the http standard, so you could easily connect compliant tools.

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You can get a lot of traction with long polling. I use that in a couple of places where we talk to Consul to avoid a lot of polling nonsense. If I could figure out one last spot (where it's buried behind a service call due to separation of concerns), I could remove a lot of the remaining jitter from a rendezvous algorithm (tell me when all servers have made a change)

> It would be great if such a mechanism was part of the http standard, so you could easily connect compliant tools.

Not sure HTTP is the best approach to the suggested method. Since you control both ends, there are surely better protocols to use, like QUIC or something similar (or just straight up UDP).

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