const fetch = require('isomorphic-unfetch') exports.fetch = (url, method = 'HEAD') => { return fetch(url, { method }) } exports.send = (res, availability) => { res.setHeader('Cache-Control', 'maxage=0, s-maxage=3600') res.json({ availability }) } exports.sendError = (res, error) => { res.status(400).json({ error: error.message }) }