I've seen many different ways of handling res.status(<code>).send(<whatever>) especially when it comes to async functions, and I'm not sure which one is right. Can someone provide an explanation for the appropriate way to do it?

export const randomFunction = functions.runWith(functionDefault).https.onRequest(async (req, res) => {
    functionSecurity.setHttpSecurityHeaders(res);

    if (req.body.automaticFail) {
        res.status(500).send(`This function automatically bombed out`);
        return Promise.reject();
    }
    
    res.status(200).send(`This function automatically succeeded`);
    return Promise.resolve(200);
}

export const randomFunction2 = functions.runWith(functionDefault).https.onRequest(async (req, res) => {
    functionSecurity.setHttpSecurityHeaders(res);

    if (req.body.automaticFail) {
        return res.status(500).send(`This function automatically bombed out`);
    }
    
    return res.status(200).send(`This function automatically succeeded`);
}

export const randomFunction3 = functions.runWith(functionDefault).https.onRequest(async (req, res) => {
    functionSecurity.setHttpSecurityHeaders(res);

    if (req.body.automaticFail) {
        res.status(500).send(`This function automatically bombed out`);
    }
    
    res.status(200).send(`This function automatically succeeded`);
}

Perhaps even none of these are correct? I'm just confused onw how asyncronous operations are supposed to work.