diff --git a/main.go b/main.go
index caefd12..b9da6b3 100644
--- a/main.go
+++ b/main.go
@@ -38,7 +38,8 @@ var client = &http.Client{
 				req.Header[key] = val
 			}
 		}
-				// S3 重定向时添加必要的头
+
+		// S3 重定向时添加必要的头
 		if strings.Contains(req.URL.Host, "amazonaws.com") {
 			req.Header.Set("x-amz-content-sha256", "UNSIGNED-PAYLOAD")
 		}
@@ -514,6 +515,9 @@ func sendRequestWithContext(ctx context.Context, method, url string, headers htt
 	}
 
 	req.Header = headers
+	
+	// 为可能的 S3 重定向预先添加头
+	req.Header.Set("x-amz-content-sha256", "UNSIGNED-PAYLOAD")
 
 	startTime := time.Now()
 	resp, err := client.Do(req)