I'm the developer of Diahook (we do webhooks as a service), and I agree. It's just so annoying that we have to implement signing ourselves instead of just using

I'm the developer of Diahook (we do webhooks as a service), and I agree. It's just so annoying that we have to implement signing ourselves instead of just using client TLS certificates. Though the problem is that there are so many places in the stack that interact with your request before it hits user code (load balancer, web server, etc), that getting anything like this to work is wishful thinking...