Get the URL of the page from which an ajax request has been launched within ajax callback

I'm calling a server-side function written in PHP via wp-ajax. The server-side function eventually redirects to another page for an authentication step, and then redirects back to the initially shown page. For this to work in a generic way, I need to pass the URL from which the AJAX request was fired onto the server-side function. How can I actually do this?

When I try for example this, I get the link to wp-admin/admin-ajax.php...

I know that I could in theory use window.hrefor whatever in js and send that to the server, but I want to avoid this extra-piece of data sent, as I'm thinking that there must be some built-in wp feature for this...?

Topic site-url ajax php urls Wordpress

Category Web

1
answered at

Ok got it, knew there must be some built-in WP solution to this. Simply call wp_get_referer() in your callback (for details, see this).

At least it's working as I need it, let me know if there's any better solution.

UPDATE

Thanks to @Tom J Nowell, we should also mention that referrers could get stripped for privacy reasons or similar. To thus be on the safe side, there's no way around passing the referrer's URL explicitely to the data sent across AJAX, like using document.location.href.

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