Allow Slack implementation to accept self signed certificates

[modem158]

We run slack locally and the address is https but our certs are self signed. I can send a insecure http webhook to a python connector that then forwareds it along to Slack but doesn't verify our self signed certs. When I send the webhook directly to our https slack implementation it fails. I think that I can't send a slack webhook because in the background the slack endpoint wants to verify the certificate and it can't because it's self signed.

In telegraph it looks like you can set "insecure_skip_verify = true" and it will ignore a self signed certificate.

Could this possibly be implemented in the Slack and other notification endpoints?