feat: add Streamable HTTP transport support - #250
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MCP clients using the HTTP transport (type: "http") send POST requests with JSON payloads and Accept: application/json, but without the text/event-stream header. The existing routing only matched requests with Accept: text/event-stream, causing Streamable HTTP requests to fall through to the React Router handler and fail. This adds an isStreamableHttp check that detects requests with: - POST method + Content-Type: application/json, or - Accept: application/json (GET for OAuth discovery) And routes them to MyMCP.serve() — the proper Streamable HTTP handler. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Summary
MCP clients using the Streamable HTTP transport (
type: "http") send POST requests with JSON payloads andAccept: application/json, but without thetext/event-streamheader. The existing routing only matched requests withAccept: text/event-stream, causing Streamable HTTP requests to fall through to the React Router handler and fail with a 405 error.Changes
Added an
isStreamableHttpcheck insrc/index.tsthat detects requests with:POSTmethod +Content-Type: application/json, orAccept: application/json(GET for OAuth discovery)And routes them to
MyMCP.serve()— the proper Streamable HTTP handler.Related
Closes #244