id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type
144602564,MDU6SXNzdWUxNDQ2MDI1NjQ=,809,Opening netcdf dataset from OpenDAP server,5869186,closed,0,,,4,2016-03-30T14:01:58Z,2016-03-30T17:25:26Z,2016-03-30T15:44:56Z,NONE,,,,"Hi,

First of, congrats and thank you guys for this amazing work. Xarray is wicked!

I am in the process of using your package in one of the suite of tool I am developing (i.e. [PySeidon](https://github.com/GrumpyNounours/PySeidon)). Unfortunately I am running into the following issue while opening netcdf datasets from our OpenDAP server.

Here is what's going on:
When I run

``` python
import xarray as xr
remote_data = xr.open_dataset('http://ecoii.acadiau.ca/thredds/dodsC/ecoii/test/FVCOM3D_dngrid_BF_20130619_20130621.nc', decode_times=False, drop_variables=['siglay', 'siglev'])
```

I get the following error:
`RuntimeError: NetCDF: Unknown file format`

Yet when I run

``` python
from pydap.client import open_url
remote_data = open_url('http://ecoii.acadiau.ca/thredds/dodsC/ecoii/test/FVCOM3D_dngrid_BF_20130619_20130621.nc')
```

It works like a charm.

Could you please tell me what I'm doing wrong?

Cheers and thanks again for Xarray,
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