I think it is okay. E.g. if you are programming GData client, it suggest you to ...

		tszming on July 17, 2010 \| parent \| context \| favorite \| on: Ask HN: Version numbers in a REST API I think it is okay. E.g. if you are programming GData client, it suggest you to add version info (i.e. GData-Version: X.0 ) in the request header. http://code.google.com/intl/zh-TW/apis/gdata/docs/developers...