Prompt Injection in HTTP Headers: What 217M Web Responses Show
This story is from 2026-10-24. It is preserved in the archive; the latest stories are on the live feed.
Signals Corps scanned HTTP response headers from 217 million Common Crawl page responses and counted 7,959 sites sending headers aimed at AI agents. Most were harmless. Pointers to llms.txt files, pointers to MCP servers. Polite signage for visiting bots. Thirty sites went further and sent actual p…
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- 2026-10-24 12:26 · DEV Community — AI
Prompt Injection in HTTP Headers: What 217M Web Responses Show