# File lib/vcr/configuration.rb, line 218
    def define_cassette_placeholder(placeholder, tag = nil, &block)
      before_record(tag) do |interaction|
        orig_text = call_block(block, interaction)
        log "before_record: replacing #{orig_text.inspect} with #{placeholder.inspect}"
        interaction.filter!(orig_text, placeholder)
      end

      before_playback(tag) do |interaction|
        orig_text = call_block(block, interaction)
        log "before_playback: replacing #{placeholder.inspect} with #{orig_text.inspect}"
        interaction.filter!(placeholder, orig_text)
      end
    end