修改执行流程，支持 UseRawKey 参数，整理用例

Author: carsonxu

demo/demo.js

@@ -181,7 +181,7 @@ function putBucketCors() {
                 "AllowedOrigin": ["*"],
                 "AllowedMethod": ["GET", "POST", "PUT", "DELETE", "HEAD"],
                 "AllowedHeader": ["*"],
-                "ExposeHeader": ["ETag", "x-cos-acl", "x-cos-version-id", "x-cos-delete-marker", "x-cos-server-side-encryption"],
+                "ExposeHeader": ["ETag", "Content-Length", "x-cos-acl", "x-cos-version-id", "x-cos-delete-marker", "x-cos-server-side-encryption"],
                 "MaxAgeSeconds": "5"
             }]
         }