Duplicate subdomain mapping on Google App Engine with www prefix

Some of my clients are having problems accessing my Google App Engine website from typing in the URL. Despite it being written down - it's on a printed invite - as http://subdomain.domain.com (which works), people insist on putting in http://www.subdomain.domain.com

Is there some way of adding another mapping to m开发者_StackOverflow中文版ake www.subdomain.domain.com point at subdomain.domain.com??

Help greatly appreciated.

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You should be able to simply add that subdomain in Google Apps (following the instructions here). Failing that, you could use a third-party redirection service to send a 302 to your 'real' subdomain.