Google has added a new firewall feature to their cloud offering. Currently in beta, the App Engine firewall, which is in beta, lets developers specify a set of rules, order them by priority and specify an IP address or a set of IP addresses. These are used to block or allow access to an application.
Planning a trip behind the Great Firewall of China? Make sure to check if the website you need to get stuff done is blocked before you go with this handy tool.