json-head. I’ve deployed another App Engine mini-app, which provides a JSON-P API for running HEAD requests against an arbitrary URL (useful for checking things like Content-Length and Content-Type headers and whether a URL returns 200). App Engine’s urlfetch limitations mean it can only deal with port 80 and 443 requests.
Recent articles
- New prompt injection papers: Agents Rule of Two and The Attacker Moves Second - 2nd November 2025
- Hacking the WiFi-enabled color screen GitHub Universe conference badge - 28th October 2025
- Video: Building a tool to copy-paste share terminal sessions using Claude Code for web - 23rd October 2025