wsgidav
wsgidav.dc
wsgidav.mw
wsgidav.prop_man
wsgidav.lock_man
wsgidav.samples
wsgidav.server
returns tuple (list, value)
content ranges as values to their parsed components in the tuple (seek_position/abs position of first byte, abs position of last byte, num_of_bytes_to_read)
total length for Content-Length