Get headers

[abrahamjuliot]

https://developers.google.com/apps-script/reference/url-fetch/url-fetch-app
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers

[abrahamjuliot]

https://ipapi.co/json/ (1500 per day)
https://api.ipify.org/?format=json (no limits)
https://jsonip.com (no limits)
https://www.cloudflare.com/cdn-cgi/trace (no limits)
https://api6.ipify.org/?format=json (no limits)

https://stackoverflow.com/questions/391979/how-to-get-clients-ip-address-using-javascript

[abrahamjuliot]

concept: https://es6console.com/kd43wbdh/

(async function() {
    const api = 'https://api6.ipify.org/?format=json'
    const res = await fetch(api)
    const data = await res.json()
    console.log(data)
})()

https://es6console.com/kd8bnj7k/

const getHeaders = async () => {
  const promiseUndefined = new Promise(resolve => resolve(undefined))

  try {
    const api = 'https://www.cloudflare.com/cdn-cgi/trace'
    const res = await fetch(api)
    const text = await res.text()
    const lines = text.match(/^(?:ip|uag|loc|tls)=(.*)$/igm)
    const data = {}
    lines.forEach(line => {
      const key = line.split('=')[0]
      const value = line.substr(line.indexOf('=') + 1)
      data[key] = value
    })
    return data
  }
  catch (error) {
  }
}
(async function() {
  const headers = await getHeaders()
  console.log(headers)
})()