title: Verify HTTP request from Google Cloud Scheduler
body: <p>What's the process for verifying the HTTP request from Google Cloud scheduler?  The docs (<a href="https://cloud.google.com/scheduler/docs/creating" rel="noreferrer">https://cloud.google.com/scheduler/docs/creating</a>) mention you can create a job with a target of any publicly available HTTP endpoint but do not mention how the server verifies the cron/scheduler request.</p>