diff --git a/server/proxy/https.go b/server/proxy/https.go
index d6fb5d0..873e826 100644
--- a/server/proxy/https.go
+++ b/server/proxy/https.go
@@ -5,6 +5,7 @@ import (
 	"net/http"
 	"net/url"
 	"sync"
+	"strings"
 
 	"ehang.io/nps/lib/cache"
 	"ehang.io/nps/lib/common"