'Accept-Ranges', 'Age',
	'Cache-Control', 'Connection', 'Content-Type',
	'Date',
	'Expires',
	'Referer',
	'Server',
	'Via',
	'X-CCC', 'X-CID', 'X-Cache', 'X-Cache-Lookup', 'X-Livetool', 'X-Powered-By',
])

block_size = 8192

import bsddb3.dbshelve, copy, datetime, http.server, spacemap, urllib.request, urllib.error

class MyRequestHandler(http.server.BaseHTTPRequestHandler):

						with open(empty_name, 'w+b') as some_file:
							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()
					countdown = 16
					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
						else:
							req_block_size = block_size
						buffer = source.read(req_block_size)
						length = len(buffer)
						while length > 0 and stream_last < end:
							stream_pos = stream_last + length
							assert stream_pos <= end, 'Received more data then requested: pos:{} start:{} end:{}.'.format(stream_pos, start, end)
							temp_file.seek(stream_last)
							temp_file.write(buffer)
							x = new_record['_parts'] - spacemap.SpaceMap({stream_last: stream_pos})
							new_record['_parts'] = new_record['_parts'] - spacemap.SpaceMap({stream_last: stream_pos})
							countdown -= 1
							if countdown == 0:
								index[my_path_b] = old_record
								index.sync()
								countdown = 16
							old_record = copy.copy(new_record)
							stream_last = stream_pos
							if end - stream_last < block_size:
								req_block_size = end - stream_last
							buffer = source.read(req_block_size)
							length = len(buffer)
					# moving downloaded data to real file
					temp_file.close()

				index[my_path_b] = new_record
				index.sync()

			except urllib.error.HTTPError as error:
				# in case of error we don't need to do anything actually,
				# if file download stalls or fails the file would not be moved to it's location
				self.send_response(error.code)
				self.end_headers()
				print(error, repr(my_headers))
				return

		#print(index[my_path_b])

		if not os.access(file_name, os.R_OK) and os.access(temp_name, os.R_OK) and '_parts' in index[my_path_b] and index[my_path_b]['_parts'] == spacemap.SpaceMap():
			# just moving
			# drop old dirs XXX
			print('Moving temporary file to new destination.')
			os.renames(temp_name, file_name)