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HTTP/2 push comes to mind. Your services hosted behind an ALB won't be able to make us of it if the connection is dropped to HTTP/1.1

It's not just the performance – it'd be nice if backends could take advantage of the fun new features like push, stream prio, etc.

(Though with HTTP/3 around the corner, I can't imagine anyone will bother working on HTTP/2 to backends.)

Hard to support grpc without it

> so HTTP 2 doesn't have as many advantages.

Request pipelining and multiplexing are good enough reasons.