FileUploadError: URL retrieval failed for key 0d2404100fc5038aa2d41a19/course-v1:test+test001+2021_test001/block-v1:test+test001+2021_test001+type@openassessment+block@0dbe15faca6a488fa477a7cbca6b630c/3 with error An error occurred (400) when calling the HeadObject operation: Bad Request
Traceback (most recent call last):
  File "/edx/app/edxapp/venvs/edxapp/lib/python3.8/site-packages/openassessment/fileupload/backends/s3.py", line 45, in get_download_url
    if not object_exists(conn, bucket_name, key_name):
  File "/edx/app/edxapp/venvs/edxapp/lib/python3.8/site-packages/openassessment/fileupload/backends/s3.py", line 96, in object_exists
    raise e
  File "/edx/app/edxapp/venvs/edxapp/lib/python3.8/site-packages/openassessment/fileupload/backends/s3.py", line 92, in object_exists
    conn.head_object(Bucket=bucket_name, Key=key_name)
  File "/edx/app/edxapp/venvs/edxapp/lib/python3.8/site-packages/botocore/client.py", line 317, in _api_call
    return self._make_api_call(operation_name, kwargs)
  File "/edx/app/edxapp/venvs/edxapp/lib/python3.8/site-packages/botocore/client.py", line 615, in _make_api_call
    raise error_class(parsed_response, operation_name)
botocore.exceptions.ClientError: An error occurred (400) when calling the HeadObject operation: Bad Request

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/edx/app/edxapp/venvs/edxapp/lib/python3.8/site-packages/openassessment/fileupload/api.py", line 170, in download_url
    return get_download_url(self.key)
  File "/edx/app/edxapp/venvs/edxapp/lib/python3.8/site-packages/openassessment/fileupload/api.py", line 36, in get_download_url
    url = backends.get_backend().get_download_url(key)
  File "/edx/app/edxapp/venvs/edxapp/lib/python3.8/site-packages/openassessment/fileupload/backends/s3.py", line 56, in get_download_url
    raise FileUploadInternalError(ex)
openassessment.fileupload.exceptions.FileUploadInternalError: An error occurred (400) when calling the HeadObject operation: Bad Request