title: While downloading azure blobs to local file system an exception occurs
body: <p>While downloading azure blobs to local file system, I'm getting the following exception:</p>
  
  <pre><code>Client-Request-ID=99bdb0e4-2d1c-11e8-8fe6-00155dbf7128 Retry policy did not allow for a retry: Server-Timestamp=Wed, 21 Mar 2018 15:29:09 GMT, Server-Request-ID=1e7ab8f5-101e-0076-5329-c16a24000000, HTTP status code=404, Exception=The specified blob does not exist.
  ErrorCode: BlobNotFound&lt;?xml version="1.0" encoding="utf-8"?&gt;&lt;Error&gt;&lt;Code&gt;BlobNotFound&lt;/Code&gt;&lt;Message&gt;The specified blob does not exist.
  RequestId:1e7ab8f5-101e-0076-5329-c16a24000000Time:2018-03-21T15:29:09.6565984Z&lt;/Message&gt;&lt;/Error&gt;.
  Traceback (most recent call last):
    File "C:\Program Files\Commvault\ContentStore\Automation\CloudApps\CloudAppsUtils\cahelper.py", line 483, in download_contents_azure
      session.get_blob_to_path(container_name,fl,fl)
    File "C:\Program Files\Python36\lib\site-packages\azure\storage\blob\baseblobservice.py", line 1817, in get_blob_to_path
      timeout)
    File "C:\Program Files\Python36\lib\site-packages\azure\storage\blob\baseblobservice.py", line 2003, in get_blob_to_stream
      raise ex
    File "C:\Program Files\Python36\lib\site-packages\azure\storage\blob\baseblobservice.py", line 1971, in get_blob_to_stream
      _context=operation_context)
    File "C:\Program Files\Python36\lib\site-packages\azure\storage\blob\baseblobservice.py", line 1695, in _get_blob
      operation_context=_context)
    File "C:\Program Files\Python36\lib\site-packages\azure\storage\common\storageclient.py", line 354, in _perform_request
      raise ex
    File "C:\Program Files\Python36\lib\site-packages\azure\storage\common\storageclient.py", line 289, in _perform_request
      raise ex
    File "C:\Program Files\Python36\lib\site-packages\azure\storage\common\storageclient.py", line 275, in _perform_request
      HTTPError(response.status, response.message, response.headers, response.body))
    File "C:\Program Files\Python36\lib\site-packages\azure\storage\common\_error.py", line 111, in _http_error_handler
      raise AzureHttpError(message, http_error.status)
  azure.common.AzureMissingResourceHttpError: The specified blob does not exist.ErrorCode: BlobNotFound
  &lt;?xml version="1.0" encoding="utf-8"?&gt;&lt;Error&gt;&lt;Code&gt;BlobNotFound&lt;/Code&gt;&lt;Message&gt;The specified blob does not exist.
  RequestId:1e7ab8f5-101e-0076-5329-c16a24000000
  Time:2018-03-21T15:29:09.6565984Z&lt;/Message&gt;&lt;/Error&gt;
  </code></pre>
  
  <p>I'm using the following code to download blobs:</p>
  
  <pre><code>def download_contents_azure(self, account_name, account_key, content):
      session=self.create_session_azure(account_name,account_key)
      os.mkdir('in place')
      os.chdir('in place')
  
      for item in content:
          # s = os.path.basename(item)
  
          path_to_file = ("/".join(item.strip("/").split('/')[1:]))
          container_name = Path(item).parts[1]
          gen = session.list_blobs(container_name)
          li = []
  
          for i in gen:
              li.append(i.name)
  
          if path_to_file in li:
              fl = os.path.basename(path_to_file)
  
              print(fl)
              c = self.splitall(item)
  
              for i in range(1,len(c)-1):
                  if path.exists(c[i]) is False:
                      os.mkdir(c[i])
                  os.chdir(c[i])
  
              session.get_blob_to_path(container_name,fl,fl)
  
              for i in range(1,len(c)-1):
                  os.chdir("..")
          else:
              c = self.splitall(item)
              for i in range(1,len(c)):
                  os.mkdir(c[i])
                  os.chdir(c[i])
  
              generator = session.list_blobs(container_name,path_to_file+'/',delimiter='/')
  
              for blob in generator:
                  bl = os.path.basename(blob.name)
                  session.get_blob_to_path(container_name,bl,bl)
  </code></pre>
  
  <p>I've a path in azure (<code>/container/folder/subfolder</code>).<br>
  I'm trying to download the structure and all the files under <code>subfolder</code>. the first file under the <code>subfolder</code> gets downloaded and then I've the above exception. Due to this, I'm unable to loop through and print the next items.</p>
  
  <p>Thoughts?</p>