v 2021.4.0 causes ValueError's in HTTP calls

Since fsspec is used in intake/intake-catalog the latest version is causing issues reading from an HTTP Catalog

"/Users/donghunl/miniconda3/envs/intake_dal37/lib/python3.7/site-packages/intake_dal/dal_catalog.py", line 69, in __init__
    super(DalCatalog, self).__init__(path, autoreload, **kwargs)
  File "/Users/donghunl/miniconda3/envs/intake_dal37/lib/python3.7/site-packages/intake_nested_yaml_catalog/nested_yaml_catalog.py", line 75, in __init__
    super(NestedYAMLFileCatalog, self).__init__(path, autoreload, **kwargs)
  File "/Users/donghunl/miniconda3/envs/intake_dal37/lib/python3.7/site-packages/intake/catalog/local.py", line 565, in __init__
    super(YAMLFileCatalog, self).__init__(**kwargs)
  File "/Users/donghunl/miniconda3/envs/intake_dal37/lib/python3.7/site-packages/intake/catalog/base.py", line 113, in __init__
    self.force_reload()
  File "/Users/donghunl/miniconda3/envs/intake_dal37/lib/python3.7/site-packages/intake/catalog/base.py", line 172, in force_reload
    self._load()
  File "/Users/donghunl/miniconda3/envs/intake_dal37/lib/python3.7/site-packages/intake_dal/dal_catalog.py", line 87, in _load
    super()._load()
  File "/Users/donghunl/miniconda3/envs/intake_dal37/lib/python3.7/site-packages/intake/catalog/local.py", line 591, in _load
    text = f.read().decode()
  File "/Users/donghunl/miniconda3/envs/intake_dal37/lib/python3.7/site-packages/fsspec/implementations/http.py", line 457, in read
    return super().read(length)
  File "/Users/donghunl/miniconda3/envs/intake_dal37/lib/python3.7/site-packages/fsspec/spec.py", line 1449, in read
    out = self.cache._fetch(self.loc, self.loc + length)
  File "/Users/donghunl/miniconda3/envs/intake_dal37/lib/python3.7/site-packages/fsspec/caching.py", line 376, in _fetch
    self.cache = self.fetcher(start, bend)
  File "/Users/donghunl/miniconda3/envs/intake_dal37/lib/python3.7/site-packages/fsspec/asyn.py", line 72, in wrapper
    return sync(self.loop, func, *args, **kwargs)
  File "/Users/donghunl/miniconda3/envs/intake_dal37/lib/python3.7/site-packages/fsspec/asyn.py", line 53, in sync
    raise result[0]
  File "/Users/donghunl/miniconda3/envs/intake_dal37/lib/python3.7/site-packages/fsspec/asyn.py", line 20, in _runner
    result[0] = await coro
  File "/Users/donghunl/miniconda3/envs/intake_dal37/lib/python3.7/site-packages/fsspec/implementations/http.py", line 507, in async_fetch_range
    "Got more bytes (%i) than requested (%i)" % (cl, end - start)
ValueError: Got more bytes (117554) than requested (31)

Downgrading to 0.8.3 resolves the issue

Reproduce loading the HTTP Catalog with the affected fsspec version, starting from implementations/http.py at async_fetch_range and caching.py at _fetch, as shown in the traceback. Compare the behavior with version 0.8.3; done means HTTP catalog reads no longer raise the reported ValueError without requiring the downgrade.