Azure Function Firewall
<p>I'm building a very lightweight API using Azure Functions, one thing I'm concerned about is abuse of the functions.  What's to stop someone hammering a single method and causing my costs to escalate? Are there any ways I can blacklist IP address' if they start acting suspicious?</p>

<p>I have a last resort of looking up the IP in Table Storage, but I'd ideally like to block the IP before it even makes it to the function, is this possible? (Programatically)</p>

<p>Nick.</p>