We've been trying to test the Content Analysis service but are finding in many case we gets "results": null' as the response. In some cases, attempting the same query a few minutes later we'll actually get data about the submitted URL, but in the bulk of (admittedly a small sample of ~ 20 domains) we will keep getting "results":null.
Is the service actually working or is there some limitation in queries tested using the YQL Console?
If this is not a limitation;
is there a reason for null results (when the given URLs are accessible online)?
is there a reason that data becomes available in a re-query?
is this service 'production ready', or should it be considered 'unstable'?
EG, even running a simple query like "select * from contentanalysis.analyze where url='http://yahoo.com'" was returning "results":null (now it's returning "an error has occurred".
Please advise on current limitations and confirm if we should be receiving a particular error. I seem to be able to make about 300 API calls ok and then I just get <results:null.> I have tried sleeping for 4 seconds before each call and the outcome is still the same.