I've checked autocomplete widget can not work in gae, as it uses like in its callback. Checking this group archives, I've found this thread: https://groups.google.com/d/topic/web2py/HdnWTp7h3Do/discussion but even if it looks like it would work, finally it was not implemented.
So, does anybody know of any workaround to make autocomplete work in GAE? BTW: A note should be added at the web2py book section (http://www.web2py.com/book/default/chapter/07#Autocomplete-Widget ) warning it does not work in gae. It will save time to many people. Regards. José L.