read_chunked

# File lib/net/http/response.rb, line 312
  def read_chunked(dest, chunk_data_io) # :nodoc:
    total = 0
    while true
      line = @socket.readline
      hexlen = line.slice(/[0-9a-fA-F]+/) or
          raise Net::HTTPBadResponse, "wrong chunk size line: #{line}"
      len = hexlen.hex
      break if len == 0
      begin
        chunk_data_io.read len, dest
      ensure
        total += len
        @socket.read 2   # \r\n
      end
    end
    until @socket.readline.empty?
      # none
    end
  end