Puppeteer: HTTPRequest is missing _interceptionId needed for Fetch.fulfillRequest

Fulfilling a request requires an absent internal Fetch interception ID.

Error message

HTTPRequest is missing _interceptionId needed for Fetch.fulfillRequest

How this error happens

CDP’s Fetch.fulfillRequest command needs an interception ID. A request merely observed through network events is not enough to resolve a paused Fetch request.

The snippets use an open Chrome/CDP page named page.

const [request] = await Promise.all([
    page.waitForRequest(() => true),
    page.goto("https://example.com/"),
]);

await request.respond({
    status: 200,
    body: "Example",
});

The public call normally catches this earlier as “Request Interception is not enabled.” This demonstrates a non-intercepted request, not a reliable way to force the deeper missing-ID invariant.

How to fix

Enable interception before requests begin and handle the original request supplied by Puppeteer.

await page.setRequestInterception(
    true
);

page.on("request", async (request) => {
    if (request.isInterceptResolutionHandled()) {
        return;
    }

    await request.respond({
        status: 200,
        contentType: "text/html",
        body: "<p>Mock response</p>",
    });
});

await page.goto(
    "https://example.com/"
);

Things to keep in mind

Do not invent _interceptionId values or copy private request fields. If this missing-ID error persists with a correctly enabled public handler, isolate plugins and manual Fetch commands. An abort makes navigation reject; observe that expected rejection in your test.

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