I have used this before to capture web hooks. Once you have setup an Object for Sendgrid and the relevant Sendgrid event attributes and a User so the webhook can log in it works perfectly
I assume you're referring to web hooks in general, not SendGrid specifically, because this will definitely NOT work with SendGrid. The SendGrid web hook communicates via POST, not GET and the data structures are sent as JSON objects, not as query string parameters. Thus, you will receive a notification, but there will be no way to parse the data from the notification.