Source

File: wp-includes/Requests/IRI.php

protected function set_userinfo($iuserinfo) {
		if ($iuserinfo === null) {
			$this->iuserinfo = null;
		}
		else {
			$this->iuserinfo = $this->replace_invalid_with_pct_encoding($iuserinfo, '!$&\'()*+,;=:');
			$this->scheme_normalization();
		}

		return true;
	}