def _parse_length_from_content_range(content_range):
if content_range is None:<EOL><INDENT>return None<EOL><DEDENT>return int(content_range.split('<STR_LIT:U+0020>', <NUM_LIT:1>)[<NUM_LIT:1>].split('<STR_LIT:/>', <NUM_LIT:1>)[<NUM_LIT:1>])<EOL>
Parses the blob length from the content range header: bytes 1-3/65537