while True:
							range = needed.pop()
							if range[0] == None:
								break
							ranges += '{}-{}'.format(range[0], range[1] - 1),
						my_headers['range'] = 'bytes=' + ','.join(ranges)

				headers['Accept-Encoding'] = 'gzip'
				request = urllib2.Request(request, headers = my_headers)

				source = urllib2.urlopen(request)
				new_record = {}
				new_record['_parts'] = record['_parts']
				headers = source.info()

				if 'content-encoding' in headers and headers['content-encoding'] == 'gzip':
					import gzip, StringIO
					buf = StringIO.StringIO(source.read())
					source = gzip.GzipFile(fileobj=buf)

				# stripping unneeded headers (XXX make this inplace?)
				for header in headers:
					if header in desc_fields:
						#if header == 'Pragma' and headers[header] != 'no-cache':
						if header == 'content-length':
							if 'content-range' not in headers:

							pass
						os.renames(empty_name, temp_name)
					temp_file = open(temp_name, 'r+b')
					if requested_ranges == None and needed == None:
						needed = new_record['_parts']
					needed.rewind()
					while True:
						# XXX can make this implicit - one request per range
						(start, end) = needed.pop()
						if start == None:
							break
						stream_last = start
						old_record = copy.copy(new_record)
						if end - start < block_size:
							req_block_size = end - start