Our MCP server was fine. Cloudflare was returning HTML.
This story is from 2026-09-10. It is preserved in the archive; the latest stories are on the live feed.
This is what our MCP endpoint returned to a client speaking JSON-RPC: HTTP / 2 403 content-type : text/html; charset=UTF-8 server : cloudflare Attention Required! | Cloudflare Please enable cookies. Sorry, you have been blocked A program was being asked to enable cookies. We did not see that for th…
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- 2026-09-10 09:50 · DEV Community — AI
Our MCP server was fine. Cloudflare was returning HTML.