issue_comments: 347917241

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https://github.com/pydata/xarray/pull/1682#issuecomment-347917241 https://api.github.com/repos/pydata/xarray/issues/1682 347917241 MDEyOklzc3VlQ29tbWVudDM0NzkxNzI0MQ== 10137 2017-11-29T16:32:56Z 2017-11-29T16:32:56Z NONE

Let's see if we can get this PR over the line... 😄

A list of engines would need some way of declaring their I/O capabilities: only file-based, only HTTP-based, or both. Something like:

```python io_engines = [ {'engine': 'netcdf4', 'capabilities': ['file', 'http']},

{'engine': 'pydap', 
 'capabilities': ['http']},

{'engine': 'scipy', 
 'capabilities': ['file']},

{'engine': 'h5netcdf',
 'capabilities': ['file']},

] ```

On xarray import or any time this option would change, the list of engines would be checked to remove unavailable engines.

 
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