alibabacloud-oss-browser-upload-cors-diagnosis

Read-only diagnosis of browser/mini-program direct-upload failures and OSS CORS: preflight OPTIONS rejected, CORS rule missing/not effective, no Access-Control-Allow-Origin, expose-headers gaps (ETag / x-oss-request-id), PostObject policy issues. Templates only; never writes. Triggers: "upload reports CORS error", "CORS config not working", "browser direct upload 403", "mini program upload failed", "Please set the etag of expose-headers", "preflight OPTIONS failed", "No 'Access-Control-Allow-Origin'". Do NOT use for transfer error codes (alibabacloud-oss-transfer-error-code-diagnosis), multipart (alibabacloud-oss-multipart-upload-diagnosis), endpoints (alibabacloud-oss-endpoint-internal-diagnosis), signed URLs (alibabacloud-oss-presigned-url-v4-diagnosis), billing (alibabacloud-oss-billing-diagnosis), direct-access links (alibabacloud-oss-direct-access-link-diagnosis), static hosting (alibabacloud-oss-static-website-diagnosis).