Fix HTTP Spec priority header parsing

util/util_test.go

@@ -60,13 +60,23 @@ func TestParsePriority(t *testing.T) {
 }
 
 func TestParsePriority_Invalid(t *testing.T) {
-	priorities := []string{"-1", "6", "aa", "-"}
+	priorities := []string{"-1", "6", "aa", "-", "o=1"}
 	for _, priority := range priorities {
 		_, err := ParsePriority(priority)
 		require.Equal(t, errInvalidPriority, err)
 	}
 }
 
+func TestParsePriority_HTTPSpecPriority(t *testing.T) {
+	priorities := []string{"u=1", "u=3", "u=7, i"} // see https://datatracker.ietf.org/doc/html/draft-ietf-httpbis-priority
+	for _, priority := range priorities {
+		_, err := ParsePriority(priority)
+		actual, err := ParsePriority(priority)
+		require.Nil(t, err)
+		require.Equal(t, 3, actual) // Always expect 3!
+	}
+}
+
 func TestPriorityString(t *testing.T) {
 	priorities := []int{0, 1, 2, 3, 4, 5}
 	expected := []string{"default", "min", "low", "default", "high", "max"}