Multiple values in X-Forwarded-Port throw NumberFormatException

[DhanarajuV]

In HttpServletRequests, below method is reading header and parsing it with Int.

public static int getPort(final HttpServletRequest req) {
	final String forwardedPort = req.getHeader("x-forwarded-port");
	return
		forwardedPort == null
			? req.getServerPort()
			: Integer.parseInt(forwardedPort)
	;
}

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Issue: Many implementations will have x-forwarded-port with multiple port numbers with comma separated. like "443,443", they will get NumberFormatException while parsing. Please fix the issue as it is a blocker to use the redirect call in these scenarios.