+     try:

+         # closing needs to be used for requests < 2.18.0

+         with closing(requests.get(url, headers=headers, stream=True)) as response:

+             if response.status_code in (200, 416):  # full content provided or reaching behind EOF

+                 # rewrite in such case

+                 f.close()

+                 f = open(relpath, 'wb')

+             response.raise_for_status()

+             length = filesize or int(response.headers.get('content-length') or 0)

+             for chunk in response.iter_content(chunk_size=1024**2):

+                 pos += len(chunk)

+                 f.write(chunk)

+                 if not (quiet or noprogress):

+                     _download_progress(length, pos, filesize)

+             if not length and not (quiet or noprogress):

+                 _download_progress(pos, pos, filesize)

+     finally:

+         f.close()

+         if pos == 0:

+             # nothing was downloaded, e.g file not found

+             os.unlink(relpath)