Google App Engine moving to IPv6; Joins Google over IPv6 Program

Google is moving Google App Engine and the appspot.com domain to IPv6 via “Google over IPv6 program” that allows ISPs with good connectivity to request IPv6 access for most Google services. “For most people, this won't require any changes to your code at all. If your App Engine code reads os.environ["REMOTE_ADDR"] in Python, or HttpServletRequest.getRemoteAddr() […]

Google is moving Google App Engine and the appspot.com domain to IPv6 via “Google over IPv6 program” that allows ISPs with good connectivity to request IPv6 access for most Google services. “For most people, this won't require any changes to your code at all. If your App Engine code reads os.environ["REMOTE_ADDR"] in Python, or HttpServletRequest.getRemoteAddr() in Java, be aware that this value may be an IPv4 address, like "192.0.2.1", or an IPv6 address, like "2001:db8::1". Now is the time to verify that your code doesn't make any IPv4-specific assumptions, so that your IPv6-ready users will have a seamless transition.Some libraries for manipulating IP addresses, should your app require one, include ipaddr and java.net.InetAddress,” explain Google.