Our app has contains content  "in the package" and content streamed from "the 
cloud"

It’s a bit new to me dealing with TsNet, latency issues, timeout, and to give 
the user feedback on status… it's a challenge…So 1 question at a time:

How do you determine that a URL is not available *before* you set a [player 
object, stream the text, show a slide, pick a YouTube etc]?

One could obvious ping it and test for "404 page not found" , but the server 
may respond with any number of messages.  Rather than checking all those, in 
there is way to do this?

put exists(sRemoteURL) into sRemoteURLAvailable
return sRemoteURLAvailable

So if it return "true" ; you can proceed with operations? If not, inform user...

Is there a header that you would get, if the URL were available?

BR

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