Your browser is a tcp/ip relay. Thoroughly nasty new(ish) attack that breaks the same-domain policy and allows intranet content to be stolen by a malicious site. Using virtual hosts (hence requiring the Host: header) is the best known protection.
Recent articles
- Wilson Lin on FastRender: a browser built by thousands of parallel agents - 23rd January 2026
- First impressions of Claude Cowork, Anthropic's general agent - 12th January 2026
- My answers to the questions I posed about porting open source code with LLMs - 11th January 2026