ngrok: set the alpn field when app_protocol is specified #131
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If the upstream is a normal HTTPs server, it expects to have http/2 negotiated
via alpn. If alpn isn't provided, it will assume http/1.1. If our edge proxy is
sending down http/2 because
app_protocol
was specified, this results in aprotocol mismatch, and invalid requests/responses will be seen.
This ensures that the negotiation happens as expected.