从谷歌Apps Script中提供JSON为“用户访问web app”

Trying to serve a JSON request made by a Google Apps Script as the user who is making the request. After thinking for a while, I realized that this cannot work, because the serving script needs to be authorized to run as the user who calls him, so the calling script would have to add some authorization info, which it doesn't, and I have no idea how to add that information (that is actually my question: which information to add to the http-request, and from where to get it). Trying to serve a JSON request made by a Google