Random lunchtime experiment that I might end up using
Proxy a webhook endpoint e.g. Jenkins, Drone.io, etc This allows you to take down a CI server and still receive webhooks (in a serverless model or front many CI servers with one hook proxy) or even test webhooks while doing local development.
Webhook hits switch (in server mode) which checks to see if the final destination hook is accessible
if it is accessible, the request is forwarded directly. If it is not available, the request
body and metadata are stored in a queue (such as SQS) and there would be an optional
capability to wake up a sleeping server.
For local webhook functionality, you can run switch in daemon mode and it will poll a given queue.
When it finds messages, it will attempt to POST with the URL (in this case localhost) and body content from the queue.