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When edit() is called, it stores url()->previous() (the Referer header) as url.intended. When update() is called after, getRedirectOption() pulls that URL out of the session and uses it as a Location header. If that URL ever contains a \n or \r\n - whether from a crafted Referer header, a stale SAML RelayState, or a proxy quirk - PHP's header() function raises this exception as a header injection safeguard.