# Get a frame's information
	private fun read_frame_info do
		var fst_byte = origin.read_byte
		var snd_byte = origin.read_byte
		if fst_byte < 0 or snd_byte < 0 then
			last_error = new IOError("Error: bad frame")
			close
			return
		end
		# First byte in msg is formatted this way :
		# |(fin - 1bit)|(RSV1 - 1bit)|(RSV2 - 1bit)|(RSV3 - 1bit)|(opcode - 4bits)
		# fin = Flag indicating if current frame is the last one for the current message
		# RSV1/2/3 = Extension flags, unsupported
		# Opcode values :
		#	%x0 denotes a continuation frame
		#	%x1 denotes a text frame
		#	%x2 denotes a binary frame
		#	%x3-7 are reserved for further non-control frames
		#	%x8 denotes a connection close
		#	%x9 denotes a ping
		#	%xA denotes a pong
		#	%xB-F are reserved for further control frames
		var opcode = fst_byte & 0b0000_1111
		if opcode == 9 then
			origin.write_bytes(pong_msg)
			return
		end
		if opcode == 8 then
			close
			return
		end
		frame_type = opcode
		# Second byte is formatted this way :
		# |(mask - 1bit)|(payload length - 7 bits)
		# As specified, if the payload length is 126 or 127
		# The next 16 or 64 bits contain an extended payload length
		var mask_flag = snd_byte & 0b1000_0000
		var len = snd_byte & 0b0111_1111
		var payload_ext_len = 0
		if len == 126 then
			var tmp = origin.read_bytes(2)
			if tmp.length != 2 then
				last_error = new IOError("Error: received interrupted frame")
				origin.close
				return
			end
			payload_ext_len += tmp[0].to_i << 8
			payload_ext_len += tmp[1].to_i
		else if len == 127 then
			var tmp = origin.read_bytes(8)
			if tmp.length != 8 then
				last_error = new IOError("Error: received interrupted frame")
				origin.close
				return
			end
			for i in [0 .. 8[ do
				payload_ext_len += tmp[i].to_i << (8 * (7 - i))
			end
		end
		if mask_flag != 0 then
			origin.read_bytes_to_cstring(mask, 4)
			has_mask = true
		else
			mask.memset(0, 4)
			has_mask = false
		end
		if payload_ext_len != 0 then
			len = payload_ext_len
		end
		frame_length = len
		frame_cursor = 0
	end