Add the EXACT selector.

README.rst

@@ -161,7 +161,7 @@ INT xset.which(ENUM select)
 ::
 
       INT xset.which(
-            ENUM {UNIQUE, FIRST, LAST, SHORTEST, LONGEST} select=UNIQUE
+            ENUM {UNIQUE, EXACT, FIRST, LAST, SHORTEST, LONGEST} select=UNIQUE
       )
 
 Returns ...

src/patricia.c

@@ -278,6 +278,10 @@ pt_search(const struct pt_y * const restrict y,
 			match->min = y->idx;
 		if (y->idx > match->max)
 			match->max = y->idx;
+		if (*c == '\0') {
+			match->exact = y->idx;
+			return (0);
+		}
 	}
 
 	if (i < y->len)
@@ -306,6 +310,7 @@ PT_Prefixes(const struct pt_y * const restrict root,
 	match->n = 0;
 	match->min = UINT_MAX;
 	match->max = 0;
+	match->exact = UINT_MAX;
 
 	return (pt_search(root, strings, (unsigned char *)subject, match));
 }

src/patricia.h

@@ -40,6 +40,7 @@ struct match_data {
 	unsigned	*indices;
 	unsigned	limit;
 	unsigned	n;
+	unsigned	exact;
 	unsigned	min;
 	unsigned	max;
 };

src/tests/prefix.vtc

@@ -159,6 +159,7 @@ varnish v1 -vcl {
 		set resp.http.N = s.nmatches();
 		set resp.http.Which = s.which();
 		set resp.http.Which-Unique = s.which(select=UNIQUE);
+		set resp.http.Which-Exact = s.which(select=EXACT);
 		set resp.http.Which-First = s.which(select=FIRST);
 		set resp.http.Which-Last = s.which(select=LAST);
 		set resp.http.Which-Shortest = s.which(select=SHORTEST);
@@ -180,6 +181,7 @@ client c1 {
 	expect resp.http.N == "1"
 	expect resp.http.Which == "4"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "4"
 	expect resp.http.Which-First == "4"
 	expect resp.http.Which-Last == "4"
 	expect resp.http.Which-Shortest == "4"
@@ -196,6 +198,7 @@ client c1 {
 	expect resp.http.N == "2"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "3"
 	expect resp.http.Which-First == "3"
 	expect resp.http.Which-Last == "4"
 	expect resp.http.Which-Shortest == "4"
@@ -212,6 +215,7 @@ client c1 {
 	expect resp.http.N == "3"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "2"
 	expect resp.http.Which-First == "2"
 	expect resp.http.Which-Last == "4"
 	expect resp.http.Which-Shortest == "4"
@@ -228,6 +232,7 @@ client c1 {
 	expect resp.http.N == "4"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "1"
 	expect resp.http.Which-First == "1"
 	expect resp.http.Which-Last == "4"
 	expect resp.http.Which-Shortest == "4"
@@ -244,6 +249,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -260,6 +266,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -276,6 +283,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -292,6 +300,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -327,6 +336,7 @@ varnish v1 -vcl {
 		set resp.http.N = s.nmatches();
 		set resp.http.Which = s.which();
 		set resp.http.Which-Unique = s.which(select=UNIQUE);
+		set resp.http.Which-Exact = s.which(select=EXACT);
 		set resp.http.Which-First = s.which(select=FIRST);
 		set resp.http.Which-Last = s.which(select=LAST);
 		set resp.http.Which-Shortest = s.which(select=SHORTEST);
@@ -348,6 +358,7 @@ client c1 {
 	expect resp.http.N == "1"
 	expect resp.http.Which == "1"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "1"
 	expect resp.http.Which-First == "1"
 	expect resp.http.Which-Last == "1"
 	expect resp.http.Which-Shortest == resp.http.Which-First
@@ -364,6 +375,7 @@ client c1 {
 	expect resp.http.N == "2"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "2"
 	expect resp.http.Which-First == "1"
 	expect resp.http.Which-Last == "2"
 	expect resp.http.Which-Shortest == resp.http.Which-First
@@ -380,6 +392,7 @@ client c1 {
 	expect resp.http.N == "3"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "3"
 	expect resp.http.Which-First == "1"
 	expect resp.http.Which-Last == "3"
 	expect resp.http.Which-Shortest == resp.http.Which-First
@@ -396,6 +409,7 @@ client c1 {
 	expect resp.http.N == "4"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "4"
 	expect resp.http.Which-First == "1"
 	expect resp.http.Which-Last == "4"
 	expect resp.http.Which-Shortest == resp.http.Which-First
@@ -428,6 +442,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -444,6 +459,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -460,6 +476,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -573,6 +590,7 @@ varnish v1 -vcl {
 		set resp.http.N = s.nmatches();
 		set resp.http.Which = s.which();
 		set resp.http.Which-Unique = s.which(select=UNIQUE);
+		set resp.http.Which-Exact = s.which(select=EXACT);
 		set resp.http.Which-First = s.which(select=FIRST);
 		set resp.http.Which-Last = s.which(select=LAST);
 		set resp.http.Which-Shortest = s.which(select=SHORTEST);
@@ -589,6 +607,7 @@ client c1 {
 	expect resp.http.N == "3"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "3"
 	expect resp.http.Which-First == "1"
 	expect resp.http.Which-Last == "5"
 	expect resp.http.Which-Shortest == "5"
@@ -601,6 +620,7 @@ client c1 {
 	expect resp.http.N == "2"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "1"
 	expect resp.http.Which-First == "1"
 	expect resp.http.Which-Last == "5"
 	expect resp.http.Which-Shortest == "5"
@@ -613,6 +633,7 @@ client c1 {
 	expect resp.http.N == "1"
 	expect resp.http.Which == "5"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "5"
 	expect resp.http.Which-First == "5"
 	expect resp.http.Which-Last == "5"
 	expect resp.http.Which-Shortest == "5"
@@ -625,6 +646,7 @@ client c1 {
 	expect resp.http.N == "1"
 	expect resp.http.Which == "5"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "5"
 	expect resp.http.Which-Last == "5"
 	expect resp.http.Which-Shortest == "5"
@@ -637,6 +659,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -649,6 +672,7 @@ client c1 {
 	expect resp.http.N == "3"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "10"
 	expect resp.http.Which-First == "10"
 	expect resp.http.Which-Last == "14"
 	expect resp.http.Which-Shortest == "13"
@@ -661,6 +685,7 @@ client c1 {
 	expect resp.http.N == "2"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "14"
 	expect resp.http.Which-First == "13"
 	expect resp.http.Which-Last == "14"
 	expect resp.http.Which-Shortest == "13"
@@ -673,6 +698,7 @@ client c1 {
 	expect resp.http.N == "1"
 	expect resp.http.Which == "13"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "13"
 	expect resp.http.Which-First == "13"
 	expect resp.http.Which-Last == "13"
 	expect resp.http.Which-Shortest == "13"
@@ -685,6 +711,7 @@ client c1 {
 	expect resp.http.N == "2"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "13"
 	expect resp.http.Which-Last == "14"
 	expect resp.http.Which-Shortest == "13"
@@ -697,6 +724,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -709,6 +737,7 @@ client c1 {
 	expect resp.http.N == "4"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "17"
 	expect resp.http.Which-First == "17"
 	expect resp.http.Which-Last == "28"
 	expect resp.http.Which-Shortest == "27"
@@ -721,6 +750,7 @@ client c1 {
 	expect resp.http.N == "3"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "28"
 	expect resp.http.Which-First == "20"
 	expect resp.http.Which-Last == "28"
 	expect resp.http.Which-Shortest == "27"
@@ -733,6 +763,7 @@ client c1 {
 	expect resp.http.N == "2"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "20"
 	expect resp.http.Which-First == "20"
 	expect resp.http.Which-Last == "27"
 	expect resp.http.Which-Shortest == "27"
@@ -745,6 +776,7 @@ client c1 {
 	expect resp.http.N == "1"
 	expect resp.http.Which == "27"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "27"
 	expect resp.http.Which-First == "27"
 	expect resp.http.Which-Last == "27"
 	expect resp.http.Which-Shortest == "27"
@@ -757,6 +789,7 @@ client c1 {
 	expect resp.http.N == "4"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "17"
 	expect resp.http.Which-Last == "28"
 	expect resp.http.Which-Shortest == "27"
@@ -769,6 +802,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -781,6 +815,7 @@ client c1 {
 	expect resp.http.N == "3"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "39"
 	expect resp.http.Which-First == "38"
 	expect resp.http.Which-Last == "40"
 	expect resp.http.Which-Shortest == "38"
@@ -793,6 +828,7 @@ client c1 {
 	expect resp.http.N == "2"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "40"
 	expect resp.http.Which-First == "38"
 	expect resp.http.Which-Last == "40"
 	expect resp.http.Which-Shortest == "38"
@@ -805,6 +841,7 @@ client c1 {
 	expect resp.http.N == "1"
 	expect resp.http.Which == "38"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "38"
 	expect resp.http.Which-First == "38"
 	expect resp.http.Which-Last == "38"
 	expect resp.http.Which-Shortest == "38"
@@ -817,6 +854,7 @@ client c1 {
 	expect resp.http.N == "2"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "33"
 	expect resp.http.Which-Last == "38"
 	expect resp.http.Which-Shortest == "38"
@@ -829,6 +867,7 @@ client c1 {
 	expect resp.http.N == "1"
 	expect resp.http.Which == "38"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "38"
 	expect resp.http.Which-Last == "38"
 	expect resp.http.Which-Shortest == "38"
@@ -841,6 +880,7 @@ client c1 {
 	expect resp.http.N == "1"
 	expect resp.http.Which == "38"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "38"
 	expect resp.http.Which-Last == "38"
 	expect resp.http.Which-Shortest == "38"
@@ -853,6 +893,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -865,6 +906,7 @@ client c1 {
 	expect resp.http.N == "3"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "61"
 	expect resp.http.Which-First == "56"
 	expect resp.http.Which-Last == "62"
 	expect resp.http.Which-Shortest == "56"
@@ -877,6 +919,7 @@ client c1 {
 	expect resp.http.N == "2"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "62"
 	expect resp.http.Which-First == "56"
 	expect resp.http.Which-Last == "62"
 	expect resp.http.Which-Shortest == "56"
@@ -889,6 +932,7 @@ client c1 {
 	expect resp.http.N == "1"
 	expect resp.http.Which == "56"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "56"
 	expect resp.http.Which-First == "56"
 	expect resp.http.Which-Last == "56"
 	expect resp.http.Which-Shortest == "56"
@@ -901,6 +945,7 @@ client c1 {
 	expect resp.http.N == "3"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "57"
 	expect resp.http.Which-First == "56"
 	expect resp.http.Which-Last == "58"
 	expect resp.http.Which-Shortest == "56"
@@ -913,6 +958,7 @@ client c1 {
 	expect resp.http.N == "2"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "58"
 	expect resp.http.Which-First == "56"
 	expect resp.http.Which-Last == "58"
 	expect resp.http.Which-Shortest == "56"
@@ -925,6 +971,7 @@ client c1 {
 	expect resp.http.N == "2"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "50"
 	expect resp.http.Which-Last == "56"
 	expect resp.http.Which-Shortest == "56"
@@ -937,6 +984,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -949,6 +997,7 @@ client c1 {
 	expect resp.http.N == "3"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "72"
 	expect resp.http.Which-First == "67"
 	expect resp.http.Which-Last == "74"
 	expect resp.http.Which-Shortest == "74"
@@ -961,6 +1010,7 @@ client c1 {
 	expect resp.http.N == "2"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "67"
 	expect resp.http.Which-First == "67"
 	expect resp.http.Which-Last == "74"
 	expect resp.http.Which-Shortest == "74"
@@ -973,6 +1023,7 @@ client c1 {
 	expect resp.http.N == "1"
 	expect resp.http.Which == "74"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "74"
 	expect resp.http.Which-First == "74"
 	expect resp.http.Which-Last == "74"
 	expect resp.http.Which-Shortest == "74"
@@ -985,6 +1036,7 @@ client c1 {
 	expect resp.http.N == "3"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "65"
 	expect resp.http.Which-Last == "74"
 	expect resp.http.Which-Shortest == "74"
@@ -997,6 +1049,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -1010,6 +1063,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -1022,6 +1076,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -1034,6 +1089,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -1046,6 +1102,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -1058,6 +1115,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -1070,6 +1128,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -1082,6 +1141,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -1094,6 +1154,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -1106,6 +1167,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -1118,6 +1180,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -1130,6 +1193,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -1142,6 +1206,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -1154,6 +1219,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -1166,6 +1232,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -1178,6 +1245,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -1190,6 +1258,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -1202,6 +1271,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -1214,6 +1284,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -1226,6 +1297,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -1238,6 +1310,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -1250,6 +1323,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -1262,6 +1336,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -1274,6 +1349,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -1286,6 +1362,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -1298,6 +1375,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -1310,6 +1388,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -1322,6 +1401,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -1334,6 +1414,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -1346,6 +1427,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
@@ -1358,6 +1440,7 @@ client c1 {
 	expect resp.http.N == "0"
 	expect resp.http.Which == "0"
 	expect resp.http.Which-Unique == resp.http.Which
+	expect resp.http.Which-Exact == "0"
 	expect resp.http.Which-First == "0"
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"

src/vmod_selector.c

@@ -387,6 +387,8 @@ select(VRT_CTX, const struct match_data * const restrict match,
 		}
 		return match->indices[0];
 	}
+	if (selects == vmod_enum_EXACT)
+		return match->exact;
 	if (selects == vmod_enum_FIRST)
 		return match->min;
 	if (selects == vmod_enum_LAST)

src/vmod_selector.vcc

@@ -94,7 +94,8 @@ Example::
      # ...
   }
 
-$Method INT .which(ENUM {UNIQUE, FIRST, LAST, SHORTEST, LONGEST} select=UNIQUE)
+$Method INT .which(ENUM {UNIQUE, EXACT, FIRST, LAST, SHORTEST, LONGEST}
+		   select=UNIQUE)
 
 Returns ...