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[netcdfgroup] client-side timeout control reading OPeNDAP variable?

We have an NCL user who has posed the following question:

> Is there a way to set a read timeout in NCL when reading from an OPeNDAP url?
> 
> Some of the TDS urls I'm reading from periodically slow down due to
> what it seems like are corrupted cache files.  In the event this
> happens, I'd like the script to timeout after x seconds to free up
> resources.

So are there any facilities for setting a time limit for a read from an OPeNDAP 
URL in the NetCDF OPeNDAP client library?
Thanks,
 Dave Brown
 NCL developer