🤔 differentiating webhook events from github.com and GHE

[gr2m]

follow up for #1 (comment)

Use case

I want to build a GitHub app which works for both, github.com and GitHub Enterprise (GHE) installations. For GHE the available APIs (and probably the event payloads) differ per version, so it would be nice to know as the receiver of webhooks what I can do with them.

[gr2m]

Not ideal, but you could send a HEAD / request to the enterprise URL and read out the X-GitHub-Enterprise-Version header. This might be another use case to be implemented with hooks, currently discussed at #44

[gr2m]

GitHub sends additional headers when receiving webhooks from a GHES instance, see https://docs.github.com/en/enterprise/2.21/user/developers/webhooks-and-events/webhook-events-and-payloads#delivery-headers

Example

> POST /payload HTTP/1.1

> X-GitHub-Delivery: 72d3162e-cc78-11e3-81ab-4c9367dc0958
> X-GitHub-Enterprise-Version: 2.15.0
> X-GitHub-Enterprise-Host: example.com
> X-Hub-Signature: sha1=7d38cdd689735b008b3c702edd92eea23791c5f6
> X-GitHub-Event: issues