diff --git a/plugs/http/axios.ts b/plugs/http/axios.ts
index d368ca2..b376e57 100644
--- a/plugs/http/axios.ts
+++ b/plugs/http/axios.ts
@@ -37,7 +37,7 @@ _axios.interceptors.request.use(
       delEmpty(data);
       data.t = time;
     }
-    if (data != null && typeof data === "string") {
+    if (data != null && typeof data === "string" && config?.headers) {
       config.headers["Content-Type"] = "text/plain;charset=UTF-8";
     }
     return config;