ngrok: add WithAppProtocol

[jrobsonchase]

Resolves #139

Adds the ForwardsProto field to the Bind request, as well as WithAppProtocol as an HTTP/labeled option to set it when creating a tunnel.

[jrobsonchase]

Current dependencies on/for this PR:

• main
  • PR ngrok: add WithAppProtocol #141 👈

This stack of pull requests is managed by Graphite.

[jrobsonchase]

Added the tentative user-facing config options, still need agreement on them though as well as documentation of valid values.

[jrobsonchase]

Ready for review. Implements WithAppProtocol as specified here

[nikolay-ngrok]

looks straightforward 👍

[salilsub]

@jrobsonchase What does the error-logic look like if someone puts an invalid option? For example, if someone used --app-protocol moose, what would they see?

[jrobsonchase]

The configuration should fail validation and our services should return some sort of "invalid config" error. We could validate locally before sending it off, but I wouldn't. That way, we don't have to keep things synchronized between the sdk and our backend if new protocols are added. Kinda the same deal as with region validation (or lack thereof 😛)

[bobzilladev]

+1'd now that it's consistent http1/http2

[nikolay-ngrok]

👍

[salilsub]

I agree that local validation is not a great idea. I think as long as the user can identify where there is an issue, that's sufficient.