diff --git a/lib/fetch-logger.ts b/lib/fetch-logger.ts
index 0fc004e..0263074 100644
--- a/lib/fetch-logger.ts
+++ b/lib/fetch-logger.ts
@@ -37,17 +37,43 @@ export const createFetchWithLogger = (options: FetchLoggerOptions = {}) => {
       // 使用统一的 Token 存储键
       const token = await storage.getItem(TOKEN_KEY)
 
-      if (token) {
-        init = {
-          ...init,
-          headers: {
-            ...init?.headers,
-            authorization: `Bearer ${token}`,
-          },
+      // 确保 headers 是一个对象
+      const headers: Record<string, string> = {}
+      if (init?.headers) {
+        if (init.headers instanceof Headers) {
+          init.headers.forEach((value, key) => {
+            headers[key] = value
+          })
+        } else if (Array.isArray(init.headers)) {
+          init.headers.forEach(([key, value]) => {
+            headers[key] = value as string
+          })
+        } else {
+          Object.assign(headers, init.headers)
         }
       }
 
-      const response = await originalFetch(input, init)
+      // 添加 Bearer Token
+      if (token) {
+        headers['authorization'] = `Bearer ${token}`
+      }
+
+      // 确保 Content-Type 正确设置
+      if (method !== 'GET' && method !== 'HEAD' && !headers['Content-Type']) {
+        headers['Content-Type'] = 'application/json'
+      }
+
+      // 序列化请求体（如果是对象）
+      let body = init?.body
+      if (body && typeof body === 'object' && !(body instanceof FormData) && !(body instanceof URLSearchParams)) {
+        body = JSON.stringify(body)
+      }
+
+      const response = await originalFetch(input, {
+        ...init,
+        headers,
+        ...(body !== undefined && { body }),
+      })
 
       // 401 未授权处理
       if (response.status === 401 && !isRedirecting) {