How can Apps Script WebApp retrieve request's cookie in doGet(e)?

I want to pass a (HttpOnly) cookie to Google Apps Script doGet(e) endpoint (e.g. from fetch(...) on the client), but there doesn't seem to be any way to retrieve incoming cookies/headers out of e. I have tried logging all e properties using

function doGet(e) {
    return ContentService.createTextOutput(
        JSON.stringify(e)
    ).setMimeType(ContentService.MimeType.JSON);
}

and querying it with curl
curl -L --cookie "name=Jane" "$webapp_endpoint"
curl -L --header "Cookie: name=Jane" "$webapp_endpoint"

Responses had no cookie info at all. Is it not possible to retrieve?

The e parameter only provides query parameters (i.e., e.parameter, e.parameters) and does not expose HTTP headers, including cookies. This is a known and documented limitation of Google Apps Script Web Apps.

a possible workaround would be to send the cookie value explicitly as a query parameter

On the client side :

curl -L "https://script.google.com/macros/s/XXX/exec?token=Jane"

And in your doGet(e):

function doGet(e) {
  const token = e.parameter.token;
  return ContentService.createTextOutput(`Hello ${token}`);
}

hope this was of help to you