在下面收集的ABNF中，列表规则根据[RFC7230]的第1.2节进行了扩展。

    1.    Age = delta-seconds
    3.    Cache-Control = *( "," OWS ) cache-directive *( OWS "," [ OWS cache-directive ] )
    5.    Expires = HTTP-date
    7.    HTTP-date = <HTTP-date, see [RFC7231], Section 7.1.1.1>
    9.    OWS = <OWS, see [RFC7230], Section 3.2.3>
    11.    Pragma = *( "," OWS ) pragma-directive *( OWS "," [ OWS pragma-directive ] )
    13.    Warning = *( "," OWS ) warning-value *( OWS "," [ OWS warning-value ] )
    15.    cache-directive = token [ "=" ( token / quoted-string ) ]
    17.    delta-seconds = 1*DIGIT
    19.    extension-pragma = token [ "=" ( token / quoted-string ) ]
    21.    field-name = <field-name, see [RFC7230], Section 3.2>
    23.    port = <port, see [RFC7230], Section 2.7>
    24.    pragma-directive = "no-cache" / extension-pragma
    25.    pseudonym = <pseudonym, see [RFC7230], Section 5.7.1>
    27.    quoted-string = <quoted-string, see [RFC7230], Section 3.2.6>
    29.    token = <token, see [RFC7230], Section 3.2.6>
    31.    uri-host = <uri-host, see [RFC7230], Section 2.7>
    33.    warn-agent = ( uri-host [ ":" port ] ) / pseudonym
    34.    warn-code = 3DIGIT
    35.    warn-date = DQUOTE HTTP-date DQUOTE
    36.    warn-text = quoted-string
    37.    warning-value = warn-code SP warn-agent SP warn-text [ SP warn-date ]