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[thredds] Checking if a THREDDS url is live?

How would I go about checking to see if a TDS url is live or not? A few of the TDS urls I regularly use (in addition to my own) are having problems with caching on very large aggregated datasets, but the request just kind of hangs there for a while. What I'd like to do is make sure a TDS url is good before I attempt to grab data from it.

Is this possible?

Thanks,
John