fix: avoid changing Content-Type to be text/plain (#361)

Avoid changing Content-Type to be  text/plain when retrying request

src/utils/request/index.ts

@@ -141,7 +141,7 @@ const transform: AxiosTransform = {
         resolve(config);
       }, config.requestOptions.retry.delay || 1);
     });
-
+    config.headers = { ...config.headers, 'Content-Type': 'application/json;charset=UTF-8' };
     return backoff.then((config) => request.request(config));
   },
 };