class EventMachine::Protocols::HeaderAndContentProtocol

def receive_line line
  case @hc_mode
  when :discard_blanks
    unless line == ""
      @hc_mode = :headers
      receive_line line
    end
  when :headers
    if line == ""
      raise "unrecognized state" unless @hc_headers.length > 0
      if respond_to?(:receive_headers)
        receive_headers @hc_headers
      end
      # @hc_content_length will be nil, not 0, if there was no content-length header.
      if @hc_content_length.to_i > 0
        set_binary_mode @hc_content_length
      else
        dispatch_request
      end
    else
      @hc_headers << line
      if ContentLengthPattern =~ line
        # There are some attacks that rely on sending multiple content-length
        # headers. This is a crude protection, but needs to become tunable.
        raise "extraneous content-length header" if @hc_content_length
        @hc_content_length = $1.to_i
      end
      if @hc_headers.length == 1 and respond_to?(:receive_first_header_line)
        receive_first_header_line line
      end
    end
  else
    raise "internal error, unsupported mode"
  end
end