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Read the value of a specific cookie by name directly on Azion’s global network and use it to shape the response. This is helpful for A/B testing, personalization, or any logic that depends on data your application already stores in the visitor’s cookies.

const COOKIE_NAME = "hubspotutk"


function getCookie(request, name) {
  let result = ""
  const cookieString = request.headers.get("Cookie")
  if (cookieString) {
    const cookies = cookieString.split(";")
    cookies.forEach(cookie => {
      const cookiePair = cookie.split("=", 2)
      const cookieName = cookiePair[0].trim()
      if (cookieName === name) {
        const cookieVal = cookiePair[1]
        result = cookieVal
      }
    })
  }
  return result
}


function handleRequest(request) {
  const cookie = getCookie(request, COOKIE_NAME)
  if (cookie) {
    return new Response(cookie)
  }
  return new Response("No cookie with name: " + COOKIE_NAME)
}


addEventListener("fetch", event => {
  event.respondWith(handleRequest(event.request))
})

How it works

The helper getCookie reads the Cookie header with request.headers.get("Cookie"), splits it on ; into individual pairs, and splits each pair on = to compare the cookie name against the one you want. When a match is found, it returns that cookie’s value. The fetch handler then calls getCookie and uses event.respondWith() with a new Response, returning either the cookie value or a message noting the cookie was not present.