diff --git a/lib_protocol/src/http/http_hdr_req.c b/lib_protocol/src/http/http_hdr_req.c
index 6a196dd9b3873a7971c37d9957a747c2d5fe0d6e..e2e1cb9508e94df95cdc3e50ea7641adaa684fda 100644
--- a/lib_protocol/src/http/http_hdr_req.c
+++ b/lib_protocol/src/http/http_hdr_req.c
@@ -617,9 +617,16 @@ static void __strip_url_path(ACL_VSTRING *buf, const char *url)
 {
 	ACL_ARGV *argv;
 	const char *ptr;
-	const char  last_ch = *(url + strlen(url) - 1);
+	char last_ch;
 	ACL_ITER iter;
 
+	if (url == NULL || *url == 0) {
+		ACL_VSTRING_RESET(buf);
+		ACL_VSTRING_TERMINATE(buf);
+		return;
+	}
+
+	last_ch = url[strlen(url) - 1];
 	argv = acl_argv_split(url, "/");
 
 	/* xxx: 必须将下面两行的初始化放在 acl_argv_split 的后面，因为 url