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fix: client initial GET sse include requestInit (modelcontextprotocol#895) #896

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fix: client initial GET sse include requestInit (modelcontextprotocol#895) #896

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24 changes: 24 additions & 0 deletions src/client/streamableHttp.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -502,6 +502,30 @@ describe("StreamableHTTPClientTransport", () => {
expect(global.fetch).toHaveBeenCalledTimes(2);
});

it("should always include requestInit options for initial connection in SSE", async () => {
const requestInit: RequestInit = {
credentials: 'include'
};

transport = new StreamableHTTPClientTransport(new URL("http://localhost:1234/mcp"), {
requestInit: requestInit
});

let actualReqInit: RequestInit = {};

((global.fetch as jest.Mock)).mockImplementation(
async (_url, reqInit) => {
actualReqInit = reqInit;
return new Response(null, { status: 200, headers: { "content-type": "text/event-stream" } });
}
);

await transport.start();

await transport["_startOrAuthSse"]({});
expect(actualReqInit.credentials).toBe("include");
});

it("should always send specified custom headers (Headers class)", async () => {
const requestInit = {
headers: new Headers({
Expand Down
7 changes: 4 additions & 3 deletions src/client/streamableHttp.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -208,6 +208,7 @@ export class StreamableHTTPClientTransport implements Transport {
}

const response = await (this._fetch ?? fetch)(this._url, {
...this._requestInit,
method: "GET",
headers,
signal: this._abortController?.signal,
Expand Down Expand Up @@ -301,7 +302,7 @@ export class StreamableHTTPClientTransport implements Transport {
}

private _handleSseStream(
stream: ReadableStream<Uint8Array> | null,
stream: ReadableStream<Uint8Array> | null,
options: StartSSEOptions,
isReconnectable: boolean,
): void {
Expand Down Expand Up @@ -352,8 +353,8 @@ export class StreamableHTTPClientTransport implements Transport {

// Attempt to reconnect if the stream disconnects unexpectedly and we aren't closing
if (
isReconnectable &&
this._abortController &&
isReconnectable &&
this._abortController &&
!this._abortController.signal.aborted
) {
// Use the exponential backoff reconnection strategy
Expand Down