def parse(cls, s):
if '\r\n\r\n' not in s:
raise MessageParsingError("Bad message (no CRLFCRLF found)")
head, content = s.split('\r\n\r\n', 1)
if not content:
content = None
if '\r\n' not in head:
first_line = head
hdrs = ''
else:
first_line, hdrs = head.split('\r\n', 1)
headers = Headers.parse(hdrs)
r = first_line.split(None, 2)
if len(r) != 3:
raise MessageParsingError("Bad first line: " + first_line)
if r[0] == cls.version:
code = int(r[1])
reason = r[2]
return Response(code, reason, headers, content)
elif r[2] == cls.version:
method = r[0]
uri = URI.parse(r[1])
return Request(method, uri, headers, content)
else:
raise MessageParsingError("Bad first line: " + first_line)
