If there are no other normal ways
All versions of protection only helps against spam/BTC for a nice surprise servers
, limit the number of frames which can send the client per minute, to limit the size of the input data, etc.
the front-end random generator of some hash and obfusticate him that it was not clear how it is generated.
all that happened in front is not a mystery.
Yes, there are origins, but as I understand it they did not help me, some people have bypassed.
because it only works for browsers to connect directly the server script is not banned.