mcp-configuration-custom-headers-defined-in-streamablehttpclienttran-3c42f205

THEN Ensure that requestInit (including headers) and sessionId are passed as a single second options object to StreamableHTTPClientTransport, not as separate third argument. The constructor expects exactly two arguments: URL and options. Correct usage: new StreamableHTTPClientTransport(url, { sessionId, requestInit: { headers } }).

const transport = new StreamableHTTPClientTransport(
  new URL(serverUrl),
  {
    sessionId: sessionId,
    requestInit: {
      headers: {
        "Authorization": "Bearer " + token,
      },
    },
  }
);