yyy:
 Accept         = "Accept" ":"
                           #( media-range [ accept-params ] )

          media-range    = ( "*/*"
                           | ( type "/" "*" )
                           | ( type "/" subtype )
                           ) *( ";" parameter )

          accept-params  = ";" "q" "=" qvalue *( accept-extension )

          accept-extension = ";" token [ "=" ( token | quoted-string ) ]

(23:04:08)


yyy:
 Accept         = "Accept" ":"
                           #( media-range [ accept-params ] )

          media-range    = ( "*/*"
                           | ( type "/" "*" )
                           | ( type "/" subtype )
                           ) *( ";" parameter )

          accept-params  = ";" "q" "=" qvalue *( accept-extension )

          accept-extension = ";" token [ "=" ( token | quoted-string ) ]

(23:04:04)


yyy:
 Accept         = "Accept" ":"
                           #( media-range [ accept-params ] )

          media-range    = ( "*/*"
                           | ( type "/" "*" )
                           | ( type "/" subtype )
                           ) *( ";" parameter )

          accept-params  = ";" "q" "=" qvalue *( accept-extension )

          accept-extension = ";" token [ "=" ( token | quoted-string ) ]

(23:03:18)


yyy:
Via =  "Via" ":" 1#( received-protocol received-by [ comment ] )

      received-protocol = [ protocol-name "/" ] protocol-version
      protocol-name     = token
      protocol-version  = token
      received-by       = ( host [ ":" port ] ) | pseudonym
      pseudonym         = token
(23:01:51)


yyy:
 If-None-Match = "If-None-Match" ":" ( "*" | 1#entity-tag )
(23:00:44)


yyy:
 If-Match: "xyzzy"
          If-Match: "xyzzy", "r2d2xxxx", "c3piozzzz"
          If-Match: *
(23:00:21)