diff --git a/pkg/search/storage/types.go b/pkg/search/storage/types.go
index a6559dcc..6c101daf 100644
--- a/pkg/search/storage/types.go
+++ b/pkg/search/storage/types.go
@@ -21,9 +21,9 @@ import (
 )
 
 const (
-	Equals         string = "="
-	DSLPatternType        = "dsl"
-	SQLPatternType        = "sql"
+	Equals         = "="
+	DSLPatternType = "dsl"
+	SQLPatternType = "sql"
 )
 
 type Storage interface {
diff --git a/pkg/util/filters/search_filter.go b/pkg/util/filters/search_filter.go
index 50d316a8..c2dcdf91 100644
--- a/pkg/util/filters/search_filter.go
+++ b/pkg/util/filters/search_filter.go
@@ -21,6 +21,8 @@ import (
 	"github.com/KusionStack/karbour/pkg/search/storage"
 )
 
+type ctxTyp string
+
 const (
 	searchQueryKey = "query"
 	patternTypeKey = "patternType"
@@ -63,6 +65,5 @@ func FromQueryToContext(req *http.Request, key string, defaultVal string) *http.
 		query.Del(key)
 		val = queryVal[0]
 	}
-
-	return req.WithContext(context.WithValue(req.Context(), key, val))
+	return req.WithContext(context.WithValue(req.Context(), ctxTyp(key), val))
 }