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Thanks for posting! Does Twirp use a single HTTP request per call, or does it use a persistent connection similar to the net/rpc package? If the latter, does it provide options for heartbeat, reconnect and retry?

EDIT: the blog post covers this in the protocol section. Every request is a POST :)

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It's one HTTP request per call, but requests usually flow over a persistent connection in HTTP 1.1 - it's certainly not re-opening a connection for every request.

TCP reconnection and stuff like that is at a lower level than Twirp. When you make a client of a Twirp service, the constructor accepts a http.Client which it'll use to send the requests. http.Client has a "Transport" field which is responsible for opening connections, that sort of thing. The Go standard library's defaults are pretty good, but you can tune it as you like.

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