What is your issue?

Hello, sometimes when using xarray to retrieve data from an opendap server I see a warning/error message like

Error:curl error: Failure when receiving data from the peer Error:DAP DATADDS packet is apparently too short

but the error is not raised in python. The load process ends but the data is all bad (all NaN, zeros or very large values). Checking the web I found out that the message above is from the OPeNDAP C API

I tried using a context manager to raise an error if any message was written to stdout/stderr but it didn't work (I think it is because a child process is the one writing the message). Sometimes there is no error message and the download finishs without any problem, I think it depends on the server load.

I am not sure if it is a xarray problem, a dask problem (ds.load calls dask.compute) or a NetCDF C API problem.

Bellow is minimal reproducible example. ``` import sys import io import contextlib import xarray as xr

use the current date or the previous day

url = ('http://nomads.ncep.noaa.gov:80/dods/rtofs/rtofs_global20220831' '/rtofs_glo_3dz_forecast_daily_uvel')

ds = (xr .open_dataset(url, chunks={'time': '100MB'}) .isel(time=slice(1, 9)) .sel(lon=slice(300.0, 340.0), lat=slice(-6.0, 7.0)))

for var in ds.data_vars:

print(var, flush=True)

sout, serr = io.StringIO(), io.StringIO()
with contextlib.redirect_stdout(sout):
    with contextlib.redirect_stderr(serr):
        print('foo')

        ds[var].load()
        # sometimes the message
        # Error:curl error: Failure when receiving data from the peer
        # Error:DAP DATADDS packet is apparently too short
        # appears after the load, but without raising an error.

        print('bar', file=sys.stderr)

out = sout.getvalue() + serr.getvalue()
if out != 'foo\nbar\n':
    raise ValueError(out)

```

Thank you!