my_path = myPath.group(1)
			else:
				my_path = self.path

			proxy_ignored = ('Accept', 'Accept-Encoding',
				'Cache-Control', 'Connection',
				'Host',
				'If-Modified-Since', 'If-Unmodified-Since',
				'User-Agent',
				'Via',
				'X-Forwarded-For',
			)

			print('===============[ Request ]===')
			print('===============[ {} request ]==='.format(self.command))
			print('Command:', self.command)

			for header in self.headers:
				if header in proxy_ignored:
					pass
				elif header in ('Range'):
					isRange = re.compile('bytes=(\d+)-(\d+)').match(self.headers[header])
					if isRange:
						requested_ranges = SpaceMap({int(isRange.group(1)): int(isRange.group(2)) + 1})
					else:
						return()
				else:
					print('Unknown header - ', header, ': ', self.headers[header], sep='')
					return()
				print(header, self.headers[header])
			print(my_path)

			# creating empty placeholder in index
			# if there's no space map and there's no file in real directory - we have no file
			# if there's an empty space map - file is full
			# space map generally covers every bit of file we don't posess currently
			if not my_path in index:
				info += '\nThis one is new.'
				reload = True
				record = {'_parts': None}
			else:
				record = index[my_path]
				if '_parts' in index[my_path]:
					print(record['_parts'])
					if index[my_path]['_parts'] == {0: -1}:
						index[my_path]['_parts'] = None

			# creating file name from my_path
			file_name = options.dir + os.sep + re.compile('%20').sub(' ', my_path)
			# partial file or unfinished download
			temp_name = options.dir + os.sep + '.parts' + re.compile('%20').sub(' ', my_path)

			# forcibly checking file if no file present
			if os.access(file_name, os.R_OK):
				file_stat = os.stat(file_name)
			elif '_parts' in record and os.access(temp_name, os.R_OK):
				file_stat = os.stat(temp_name)
			elif not reload:
				info += '\nFile not found or inaccessible.'
				record = {'_parts': None}
				reload = True

			# forcibly checking file if file size doesn't match with index data
			if not reload:
				if '_parts' in record and record['_parts'] == SpaceMap():
					if 'Content-Length' in record and file_stat and file_stat.st_size != int(record['Content-Length']):
						info += '\nFile size is {} and stored file size is {}.'.format(file_stat.st_size, record['Content-Length'])

				recheck = True

			print(info)
			if reload or recheck:

				try:
					request = options.root + my_path
					needed = None
					if requested_ranges != None:
						if '_parts' in record and record['_parts'] != None:
							needed = record['_parts'] & requested_ranges
						else:
							needed = requested_ranges
						ranges = ()
						print('Requesting ranges:', ranges)
						print('Not stored ranges:', record['_parts'])
						print('Requested ranges:', requested_ranges)
						print('Needed ranges:', needed)
						needed.rewind()
						while True:
							range = needed.pop()
							if range[0] == None:
								break
							ranges += '{}-{}'.format(range[0], range[1] - 1),
						request = urllib.request.Request(request, headers = {'Range': 'bytes=' + ','.join(ranges)})
						print('Missing ranges: {}, requested ranges: {}, needed ranges: {}.'.format(record['_parts'], requested_ranges, needed))
						if len(needed) > 0:
							needed.rewind()
							while True:
								range = needed.pop()
								if range[0] == None:
									break
								ranges += '{}-{}'.format(range[0], range[1] - 1),
							request = urllib.request.Request(request, headers = {'Range': 'bytes=' + ','.join(ranges)})

					with urllib.request.urlopen(request) as source:
						new_record = {}
						new_record['_parts'] = record['_parts']
						headers = source.info()

						# stripping unneeded headers (XXX make this inplace?)
						for header in headers:
							if header in desc_fields:
								#if header == 'Pragma' and headers[header] != 'no-cache':
								print(header, headers[header])
								if header == 'Content-Length':
									if 'Content-Range' not in headers:
										new_record[header] = headers[header]
										new_record[header] = int(headers[header])
								else:
									new_record[header] = headers[header]
							elif header == 'Content-Range':
								range = re.compile('^bytes (\d+)-(\d+)/(\d+)$').match(headers[header])
								if range:
									new_record['Content-Length'] = range.group(3)
									new_record['Content-Length'] = int(range.group(3))
								else:	
									assert False, 'Content-Range unrecognized.'
							elif not header in ignore_fields:
								print('Undefined header "', header, '": ', headers[header], sep='')

						if new_record['_parts'] == None:
							new_record['_parts'] = SpaceMap({0: int(new_record['Content-Length'])})
						print(new_record)

						# comparing headers with data found in index
						# if any header has changed (except Pragma) file is fully downloaded
						# same if we get more or less headers
						old_keys = set(record.keys())
						old_keys.discard('_time')
						old_keys.discard('Pragma')
						more_keys = set(new_record.keys()) - old_keys
						more_keys.discard('Pragma')
						less_keys = old_keys - set(new_record.keys())
						if len(more_keys) > 0:
							if not len(old_keys) == 0:
								print('More headers appear:', more_keys)
							reload = True
						elif len(less_keys) > 0:
							print('Less headers appear:', less_keys)
						else:
							for key in record.keys():
								if key[0] != '_' and key != 'Pragma' and not record[key] == new_record[key]:
									print('Header "', key, '" changed from [', record[key], '] to [', new_record[key], ']', sep='')
									print(type(record[key]), type(new_record[key]))
									reload = True

						if reload:
							print('Reloading.')
							if os.access(temp_name, os.R_OK):
								os.unlink(temp_name)
							if os.access(file_name, os.R_OK):
								os.unlink(file_name)
						if new_record['_parts'] == None or reload:
							new_record['_parts'] = SpaceMap({0: int(new_record['Content-Length'])})
						print(new_record)

						# downloading file or segment
						if 'Content-Length' in new_record:
							if requested_ranges == None:
								requested_ranges = new_record['_parts']
							if needed == None:
								needed = new_record['_parts']
							else:
								if len(requested_ranges) > 1:
								if len(needed) > 1:
									print("Multipart requests currently not supported.")
									assert False, 'Skip this one for now.'
						else:
							assert False, 'No Content-Length or Content-Range header.'

						if reload:
							new_record['_time'] = datetime.datetime.now()
							if self.command not in ('HEAD'):
								# file is created at temporary location and moved in place only when download completes
								if not os.access(temp_name, os.R_OK):
									empty_name = options.dir + os.sep + '.tmp'
									with open(empty_name, 'w+b') as some_file:
										pass
									os.renames(empty_name, temp_name)
								temp_file = open(temp_name, 'r+b')
								requested_ranges.rewind()
								while True:
									(start, end) = requested_ranges.pop()
									if start == None:
										break
									stream_last = start
									old_record = new_record
									if end - start < block_size:
										req_block_size = end - start
									else:
										req_block_size = block_size
									buffer = source.read(req_block_size)
						new_record['_time'] = datetime.datetime.now()
						if self.command not in ('HEAD'):
							# file is created at temporary location and moved in place only when download completes
							if not os.access(temp_name, os.R_OK):
								empty_name = options.dir + os.sep + '.tmp'
								with open(empty_name, 'w+b') as some_file:
									pass
								os.renames(empty_name, temp_name)
							temp_file = open(temp_name, 'r+b')
							needed.rewind()
							while True:
								(start, end) = needed.pop()
								if start == None:
									break
								stream_last = start
								old_record = new_record
								if end - start < block_size:
									req_block_size = end - start
								else:
									req_block_size = block_size
								buffer = source.read(req_block_size)
									print(buffer)
									length = len(buffer)
									while length > 0 and stream_last < end:
										stream_pos = stream_last + length
										assert not stream_pos > end, 'Received more data then requested: pos:{} start:{} end:{}.'.format(stream_pos, start, end)
								length = len(buffer)
								while length > 0 and stream_last < end:
									stream_pos = stream_last + length
									assert not stream_pos > end, 'Received more data then requested: pos:{} start:{} end:{}.'.format(stream_pos, start, end)
										print('Writing', length, 'bytes to temp file at position', stream_last)
										temp_file.seek(stream_last)
										temp_file.write(buffer)
										new_record['_parts'] = new_record['_parts'] - SpaceMap({stream_last: stream_pos})
									temp_file.seek(stream_last)
									temp_file.write(buffer)
									new_record['_parts'] = new_record['_parts'] - SpaceMap({stream_last: stream_pos})
										print(new_record)
										index[my_path] = old_record
										index.sync()
										old_record = new_record
										stream_last = stream_pos
										if end - stream_last < block_size:
											req_block_size = end - stream_last
										buffer = source.read(req_block_size)
									index[my_path] = old_record
									index.sync()
									old_record = new_record
									stream_last = stream_pos
									if end - stream_last < block_size:
										req_block_size = end - stream_last
									buffer = source.read(req_block_size)
										print(buffer)
										length = len(buffer)
									length = len(buffer)
								print(new_record)
								index[my_path] = new_record
								index.sync()
								temp_file.close()

								# moving downloaded data to real file
								if new_record['_parts'] == SpaceMap():
									# just moving
									# drop old dirs XXX
									print('Moving temporary file to new destination.')
									os.renames(temp_name, file_name)
							# moving downloaded data to real file
							temp_file.close()
							if new_record['_parts'] == SpaceMap():
								# just moving
								# drop old dirs XXX
								print('Moving temporary file to new destination.')
								os.renames(temp_name, file_name)

						print(new_record)
						index[my_path] = 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
					print(error)

			print('Sending response.')
			if self.command == 'HEAD':
				print('Sending HEAD response.')
				self.send_response(200)
				if 'Content-Length' in index[my_path]:
					self.send_header('Content-Length', index[my_path]['Content-Length'])
				self.send_header('Accept-Ranges', 'bytes')
				self.send_header('Content-Type', 'application/octet-stream')
				if 'Last-Modified' in index[my_path]:
					self.send_header('Last-Modified', index[my_path]['Last-Modified'])
				self.end_headers()
			else:
				if index[my_path]['_parts'] != SpaceMap():
					file_name = temp_name

				with open(file_name, 'rb') as real_file:
					file_stat = os.stat(file_name)
					if 'Range' in self.headers:
					self.send_response(200)
						self.send_response(206)
					self.send_header('Last-Modified', index[my_path]['Last-Modified'])
					if requested_ranges != None:
						ranges = ()
						requested_ranges.rewind()
						while True:
							pair = requested_ranges.pop()
							if pair[0] == None:
								break
							ranges += '{}-{}'.format(pair[0], str(pair[1] - 1)),
						self.send_header('Content-Range', 'bytes ' + ','.join(ranges) + '/' + index[my_path]['Content-Length'])
						self.send_header('Content-Range', 'bytes {}/{}'.format(','.join(ranges), index[my_path]['Content-Length']))
					else:
						self.send_response(200)
						self.send_header('Content-Length', str(file_stat.st_size))
						requested_ranges = SpaceMap({0: file_stat.st_size})
					self.send_header('Last-Modified', index[my_path]['Last-Modified'])
					self.send_header('Content-Type', 'application/octet-stream')
					self.end_headers()
					if self.command in ('GET'):
						if len(requested_ranges) > 0:
						requested_ranges.rewind()
						(start, end) = requested_ranges.pop()
						print('Seeking file to position', start)
							requested_ranges.rewind()
							(start, end) = requested_ranges.pop()
						else:
							start = 0
							end = index[my_path]['Content-Length']
						real_file.seek(start)
						if block_size > end - start:
							req_block_size = end - start
						else:
							req_block_size = block_size
						print('block_size is', req_block_size)
						buffer = real_file.read(req_block_size)
						length = len(buffer)
						while length > 0:
							self.wfile.write(buffer)
							start += len(buffer)
							if req_block_size > end - start:
								req_block_size = end - start
							if req_block_size == 0:
								break
							print('block_size is', req_block_size)
							buffer = real_file.read(req_block_size)
							length = len(buffer)
					
		def do_HEAD(self):
			return self.__process()
		def do_GET(self):
			return self.__process()