Puppeteer: Response is missing for the interception

Cooperative interception selected respond but has no response payload.

Error message

Response is missing for the interception

How this error happens

Cooperative interception needs a response payload when its selected action is respond. Passing null leaves that payload missing.

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

await page.setRequestInterception(
    true
);

page.on("request", async (request) => {
    await request.respond(
        null,
        0
    );
});

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

How to fix

Pass a response object. Check shared-listener ownership before selecting a response.

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>",
        },
        0
    );
});

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

Things to keep in mind

The intentionally invalid null argument is JavaScript; TypeScript should reject it. Depending on interception mode, invalid payloads can fail before cooperative finalization reaches this exact message.

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