Set forbidden status code on domain block

Signed-off-by: Marcus Noble <github@marcusnoble.co.uk>

index.js

@@ -26,10 +26,12 @@ http.createServer((req, response) => {
 
   if(blockList.some(b => remoteURL.hostname == b || remoteURL.hostname.endsWith("." + b))) {
     console.log("Domain is in blocklist")
+    response.writeHead(403);
     return response.end();
   }
   if(allowList.length > 0 && !allowList.some(b => remoteURL.hostname == b || remoteURL.hostname.endsWith("." + b))) {
     console.log("Domain is not in allowlist")
+    response.writeHead(403);
     return response.end();
   }