Data Hub big Raw JSON requests? Bad Idea?

I just ran 540k raw fragment items into Data Hub (in 10k blocks) and am not able to get back a Raw JSON request?

http://localhost:8080/datahub-webapp/v1/pools/HistoryPool/items/RawHistory.json

Its been over 10 minutes and I don't see a time out exception. Is this a bad idea to do this request in a browser? Should I use a JSON desktop utility?