This is a bit simpler a question than I tend to like to come here with but I\'ve been driving myself up the wall trying to find an answer to this and I absolutely cannot-
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If you don't want to pass data in the body, you can always put it into a query parameter of the url. Like:
http://yourGoogleProject.cloudfunctions.net/users?userid={userId}&bookId={bookid}
And in the cloud function you simply access the query parameter from the req object, like:
exports.users = (req, res) => {
res.status(200).send(`Hello from user: + $(req.query.userid) your bookId: $(req.query.bookid)`);
}