class Puma::NullIO

def read(length = nil, buffer = nil)
  if length.to_i < 0
    raise ArgumentError, "(negative length #{length} given)"
  end
  buffer = if buffer.nil?
    "".b
  else
    String.try_convert(buffer) or raise TypeError, "no implicit conversion of #{buffer.class} into String"
  end
  buffer.clear
  if length.to_i > 0
    nil
  else
    buffer
  end
end