I've started to have a play with writing a front page app. I'd like to do some things to do with Groups, so I tried to do a request using gadgets.io.makeRequest. Using this I can retrieve the content of some pages (e.g. http://news.bbc.co.uk) but not pages from Groups (e.g. http://tech.groups.yahoo.com/groups/ehtest). The latter returns with an error 0, which in this kind of stuff (XMLHttpRequest) tends to mean some kind of security error.

Are there security restrictions which prevent such apps retrieving information from Groups itself?