When I try to get an XML file (RSS feed) from a site I can’t
get it.
The web browsers Internet Explorer and Firefox tell me that I have no authorization.
Now I’m behind a proxy, but maybe it produces that message. Could it be
that from a site (mine) I can’t get other resource of another site (domain)
for security reasons?
If you’re trying to access an XML file on another domain using XMLHttpRequest then you can’t, on purpose… it’s a security issue. However, a workaround is to use a proxy page to grab the XML, see these:
http://developer.yahoo.com/javascript/howto-proxy.html
http://ejohn.org/blog/cross-site-xmlhttprequest/
http://ajaxpatterns.org/Cross-Domain_Proxy