Error decoding artifact resolve message

[Peter Schober]

* Petra Berg <petra.berg at cms.hu-berlin.de> [2011-12-20 08:25]:
> "GET /idp/profile/SAML2/SOAP/ArtifactResolution HTTP/1.1" or
> "GET /idp/profile/SAML1/SOAP/ArtifactResolution HTTP/1.1" request.
> This will end in an error: Error decoding artifact resolve message,
> because this request need to be transported via a HTTP *POST*.
> 
> I found out, that requesting hosts belong to Net-Range 66.249.64.0 -
> 66.249.95.255 - which is Googl Inc.
> What should I say to the users?
> Is it a wrong implementation of SAML protocol on Google service
> providers?

I suppose web crawlers are much more likely. Check the user agent
string in your webserver's logs. Try adding a robots.txt file,
-peter