I saw some request like
www.example.com/start.php?404;http://www.example.com:80
but unfortunately can’t understand if it is a valid url or how it will work.
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www.example.com/start.php?404and
http://www.example.com:80and
www.example.com/start.php?404;http://www.example.com:80are all valid URLs. But since
;is not areserved symbol, it needs to be URL encoded. See Characters allowed in a URL for the list of characters allowed in a URL.