Is it possible to access an async URL from JavaScript?

I have a page that loads an async URL into a popup. Within that popup I want JavaScript to read the parameters from the async URL, but I don't know if it's possible to retrieve it. To be clear, I don't want the browser URL (window.location), I want the URL that was opened into the popup.
Anthony PangilinanDeveloperAsked:
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Jan LouwerensSoftware EngineerCommented:
You can't access the url from within the popup, as the URL is sent to the server as part of the request, but is not sent back to the client as part of the response.

What you need to do is harvest the parameters on the server side within the async request, and return the data you need in the async response.
Jeffrey Dake Senior Director of TechnologyCommented:
I don't know the whole scope of your problem, but you could also store the paramters that are passed into the async url in a javascript variable and then from in your popup reference your javascript variable.  Since they are in the same browser window they both should have access to those variables.  I would probably do what Jan recommended, but just another possibility if you can't do that for some reason.
Brandon LyonSenior Frontend DeveloperCommented:
It might be overkill in this situation but you could also use state management to keep track of parameters and what's happening in your app. I find state managers helpful when my javascript starts to get a bit complicated.
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