Error helper url function current_url()

Hi.
I used current_url() to get current url my website but don't return current url.

Exp: My url: http://localhost:9090/ci4/public/index.php/admin/exp/
function current_url() return : http://localhost:9090/admin/exp/

How to get my current url http://localhost:9090/ci4/public/index.php/admin/exp/ .

Tks All

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