All user request have an X-AppEngine-Country header which contains the ISO-3166-1 alpha-2 country code for the user, based on the IP address of the client request. (from GAE ReleaseNotes)
ISO 3166-1 alpha-2 codes are two-letter country codes defined in ISO 3166-1, part of the ISO 3166 standard published by the International Organization for Standardization (ISO), to represent countries, dependent territories, and special areas of geographical interest.
ISO 3166-1 http://zh.wikipedia.org/zh-cn/ISO_3166-1
ISO 3166-1 alpha-2 http://en.wikipedia.org/wiki/ISO_3166-1_alpha-2
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