If client missed the version information in their request, you can send the request to the earliest supported version of the API by default. This is how Google

If client missed the version information in their request, you can send the request to the earliest supported version of the API by default. This is how Google handle it and I think it make sense. http://code.google.com/intl/zh-TW/apis/gdata/docs/developers-guide.html http://code.google.com/intl/zh-TW/apis/gdata/docs/developers...