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diff --git a/personal-blog/frontend/src/api/config.js b/personal-blog/frontend/src/api/config.js
index adc6f70..6a37957 100644
--- a/personal-blog/frontend/src/api/config.js
+++ b/personal-blog/frontend/src/api/config.js
@@ -20,6 +20,14 @@ api.interceptors.request.use(
     if (token) {
       config.headers.Authorization = `Bearer ${token}`
     }
+    // FormData 上传必须移除 JSON 默认 Content-Type，让浏览器自动加 multipart boundary
+    if (typeof FormData !== 'undefined' && config.data instanceof FormData) {
+      if (typeof config.headers.delete === 'function') {
+        config.headers.delete('Content-Type')
+      } else {
+        delete config.headers['Content-Type']
+      }
+    }
     return config
   },
   (error) => Promise.reject(error)