Azure functions HTTP 2.0 Proxy setting – Server Fault

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In a Function App in the azure portal, under the configuration settings there is a an option regarding HTTP 2.0

Options are

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This help page also mentions the environment variable
HTTP20_ONLY_PORT

I did some experiementation by creating a isolated process function, which then opened another port for gRPC communications in the hope the above settings may, as it says, forward HTTP2 traffic to the HTTP20_ONLY_PORT. But after a day of experimentation I came up empty handed.

Anyone know what this setting actually does under the hood ?

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