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fix(mcp): strip WWW-Authenticate header to prevent spurious OAuth popups in JetBrains #796

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fix(mcp): strip WWW-Authenticate header to prevent spurious OAuth popups in JetBrains #796

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13 changes: 12 additions & 1 deletion mcp/src/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,17 @@ const CORS_HEADERS = {
"Access-Control-Allow-Headers": CORS_ALLOWED_HEADERS,
};

function stripOAuthChallenge(response: Response): Response {
if (!response.headers.has("WWW-Authenticate")) return response;
const headers = new Headers(response.headers);
headers.delete("WWW-Authenticate");
return new Response(response.body, {
status: response.status,
statusText: response.statusText,
headers,
});
}

export default {
async fetch(
request: Request,
Expand Down Expand Up @@ -46,7 +57,7 @@ export default {
headers: CORS_ALLOWED_HEADERS,
},
});
return await handler(request, env, executionCtx);
return stripOAuthChallenge(await handler(request, env, executionCtx));
} catch (e) {
const message =
e instanceof Error ? e.message : "Internal server error";
Expand Down