: epilogue -> String
    MIME ޥѡȥ᡼Ǥ epilogue ʸǤ
    ̾Υ᡼ΤȤ϶ʸäƤޤ

    ˽񤭤ǤɸΥե(ʸ)ѹޤ
    ºݤѹ뤿ˤϽ񤭤 #write_back Ƥɬפޤ

