HTTP client_kwargs authentication not used with simplecache

Using fsspec='0.8.4+70.g33d532f' if a simplecache:: prefix is used with HTTP:// it seems that authentication settings are not used leading to ClientResponseError: 401, message='Unauthorized'

This works:

import fsspec
import xarray as xr
import netrc
import aiohttp

(username, account, password) = netrc.netrc().authenticators("urs.earthdata.nasa.gov")
uri = 'https://grfn.asf.alaska.edu/door/download/S1-GUNW-A-R-137-tops-20200311_20200305-020013-43055N_41518N-PP-00fe-v2_0_2.nc'
with fsspec.open(item.data.urlpath, 
                 client_kwargs={'auth': aiohttp.BasicAuth(username, password)}) as f:
    ds = xr.open_dataset(f, group='/science/grids/data', engine='h5netcdf', chunks={})

This does not:

with fsspec.open('simplecache::'+item.data.urlpath, 
                 client_kwargs={'auth': aiohttp.BasicAuth(username, password)}) as f:
    ds = xr.open_dataset(f, group='/science/grids/data', engine='h5netcdf', chunks={})

---------------------------------------------------------------------------
ClientResponseError                       Traceback (most recent call last)
<ipython-input-17-a30d2d9da865> in <module>
      1 # with simplecache
      2 with fsspec.open('simplecache::'+item.data.urlpath, 
----> 3                  client_kwargs={'auth': aiohttp.BasicAuth(username, password)}) as f:
      4     ds = xr.open_dataset(f, group='/science/grids/data', engine='h5netcdf', chunks={})
      5 

~/GitHub/filesystem_spec/fsspec/core.py in __enter__(self)
    100         mode = self.mode.replace("t", "").replace("b", "") + "b"
    101 
--> 102         f = self.fs.open(self.path, mode=mode)
    103 
    104         self.fobjects = [f]

~/GitHub/filesystem_spec/fsspec/implementations/cached.py in <lambda>(*args, **kw)
    384             # all the methods defined in this class. Note `open` here, since
    385             # it calls `_open`, but is actually in superclass
--> 386             return lambda *args, **kw: getattr(type(self), item)(self, *args, **kw)
    387         if item in ["__reduce_ex__"]:
    388             raise AttributeError

~/GitHub/filesystem_spec/fsspec/spec.py in open(self, path, mode, block_size, cache_options, **kwargs)
    912                 autocommit=ac,
    913                 cache_options=cache_options,
--> 914                 **kwargs
    915             )
    916             if not ac:

~/GitHub/filesystem_spec/fsspec/implementations/cached.py in <lambda>(*args, **kw)
    384             # all the methods defined in this class. Note `open` here, since
    385             # it calls `_open`, but is actually in superclass
--> 386             return lambda *args, **kw: getattr(type(self), item)(self, *args, **kw)
    387         if item in ["__reduce_ex__"]:
    388             raise AttributeError

~/GitHub/filesystem_spec/fsspec/implementations/cached.py in _open(self, path, mode, **kwargs)
    637                     f2.write(data)
    638         else:
--> 639             self.fs.get(path, fn)
    640         return self._open(path, mode)
    641 

~/GitHub/filesystem_spec/fsspec/asyn.py in get(self, rpath, lpath, recursive, **kwargs)
    279         lpaths = other_paths(rpaths, lpath)
    280         [os.makedirs(os.path.dirname(lp), exist_ok=True) for lp in lpaths]
--> 281         return sync(self.loop, self._get, rpaths, lpaths)
    282 
    283 

~/GitHub/filesystem_spec/fsspec/asyn.py in sync(loop, func, callback_timeout, *args, **kwargs)
     69     if error[0]:
     70         typ, exc, tb = error[0]
---> 71         raise exc.with_traceback(tb)
     72     else:
     73         return result[0]

~/GitHub/filesystem_spec/fsspec/asyn.py in f()
     53             if callback_timeout is not None:
     54                 future = asyncio.wait_for(future, callback_timeout)
---> 55             result[0] = await future
     56         except Exception:
     57             error[0] = sys.exc_info()

~/GitHub/filesystem_spec/fsspec/asyn.py in _get(self, rpaths, lpaths, **kwargs)
    267             *[
    268                 self._get_file(rpath, lpath, **kwargs)
--> 269                 for lpath, rpath in zip(lpaths, rpaths)
    270             ]
    271         )

~/GitHub/filesystem_spec/fsspec/implementations/http.py in _get_file(self, rpath, lpath, chunk_size, **kwargs)
    177             if r.status == 404:
    178                 raise FileNotFoundError(rpath)
--> 179             r.raise_for_status()
    180             with open(lpath, "wb") as fd:
    181                 chunk = True

~/miniconda3/envs/intake-stac-gui/lib/python3.7/site-packages/aiohttp/client_reqrep.py in raise_for_status(self)
    944                 status=self.status,
    945                 message=self.reason,
--> 946                 headers=self.headers)
    947 
    948     def _cleanup_writer(self) -> None:

ClientResponseError: 401, message='Unauthorized', url=URL('https://urs.earthdata.nasa.gov/oauth/authorize?app_type=401&client_id=iwntGSgHy9yoog7Mjag0dQ&response_type=code&redirect_uri=https://grfn.asf.alaska.edu/door/oauth&state=aHR0cDovL2dyZm4uYXNmLmFsYXNrYS5lZHUvZG9vci9kb3dubG9hZC9TMS1HVU5XLUEtUi0xMzctdG9wcy0yMDIwMDMxMV8yMDIwMDMwNS0wMjAwMTMtNDMwNTVOXzQxNTE4Ti1QUC0wMGZlLXYyXzBfMi5uYw')

I also tried entering authentication settings via fsspec.config.conf['https'] = dict(client_kwargs={'auth': aiohttp.BasicAuth(username, password)}) but get the same traceback.

Reproduce the issue with the fsspec.open examples, then inspect fsspec/implementations/cached.py and fsspec/implementations/http.py, which appear in the traceback. Trace how client_kwargs moves through the simplecache path and verify that the HTTP request receives the supplied authentication when the issue is fixed.