# /sse changes: it no longer serves the HTTP+SSE transport

Calls to /sse on Cloudflare Builds MCP stopped working on July 28, 2026.

On July 28, 2026, calls to /sse stopped serving the HTTP+SSE transport. The endpoint now works as an alias for the Streamable HTTP handler. Requests fail if the client forces the deprecated HTTP+SSE transport.

## What to use instead

Connect to /mcp over Streamable HTTP, or configure the client to detect the transport automatically.

- API: Cloudflare Builds MCP (builds.mcp.cloudflare.com)
- Kind: Behaviour change
- Announced: July 28, 2026
- Takes effect: July 28, 2026
- Calls after that day: fail
- Calls it hits: `/sse`
- Source: [Announcement](https://developers.cloudflare.com/changelog/post/2026-07-28-cloudflare-mcp-servers-mcp-2026-07-28/)
- Verified: November 6, 2026, against Cloudflare Builds MCP's own pages
- Page: https://www.okapi.bot/providers/cloudflare-builds-mcp/breaking-changes/sse-changes-it-no-longer-serves-the-http-sse-transport/

## Cloudflare Builds MCP's words

> Historical /sse URLs continue to work as aliases for the same Streamable HTTP handler, but they no longer serve the deprecated HTTP+SSE transport. If a client forces SSE transport, change it to Streamable HTTP or automatic transport detection.

Okapi finds the calls this change hits in your repo and opens the pull request with the fix: https://github.com/apps/okapi-agent