server.py line 175-177 #550

old:
opcode = head[0] & 0b1111
fin = head[0] >> 7 & 1
is_masked = head[1] >> 7 & 1

modified:
opcode = self.bytetonum(head[0]) & 0b1111
fin = self.bytetonum(head[0]) >> 7 & 1
is_masked = self.bytetonum(head[1]) >> 7 & 1