diff --git a/server/ingester/flow_log/log_data/l7_flow_log.go b/server/ingester/flow_log/log_data/l7_flow_log.go
index 5c94d324660..f0f09ca64be 100644
--- a/server/ingester/flow_log/log_data/l7_flow_log.go
+++ b/server/ingester/flow_log/log_data/l7_flow_log.go
@@ -21,6 +21,7 @@ import (
 	"encoding/hex"
 	"fmt"
 	"net"
+	"net/http"
 	"time"
 
 	"github.com/deepflowio/deepflow/server/ingester/config"
@@ -558,7 +559,10 @@ func (h *L7FlowLog) fillExceptionDesc(l *pb.AppProtoLogsData) {
 	code := l.Resp.Code
 	switch datatype.L7Protocol(h.L7Protocol) {
 	case datatype.L7_PROTOCOL_HTTP_1, datatype.L7_PROTOCOL_HTTP_2:
-		h.ResponseException = GetHTTPExceptionDesc(uint16(code))
+		// only set exception message for HTTP status >= 400
+		if code >= http.StatusBadRequest {
+			h.ResponseException = GetHTTPExceptionDesc(uint16(code))
+		}
 	case datatype.L7_PROTOCOL_DNS:
 		h.ResponseException = GetDNSExceptionDesc(uint16(code))
 	case datatype.L7_PROTOCOL_DUBBO: