Detect website URL to generate qrcode

How to get the URL of a page in a web app.
I would like to get the URL of the link where I clicked the button and create a QR code.
-Since another user will enter the linked page, I would like to place the QR on the page before the link.
I don’t think you can use a fixed URL because the URL changes for each logged-in user.
Is there a way?

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