Object Storage Service:What do I do if an object cannot be previewed when I access the object?

Item

Cause

Solution

OSS

You used the default domain name or an acceleration endpoint to access the object. To ensure data transmission security, when you use the default domain name or an acceleration endpoint of OSS to access an object of a specific type in a bucket that is created at a specific point in time (for example, the Content-Type header of the object is text/html or image/jpeg), OSS forcibly adds the following headers to the response: x-oss-force-download: true and Content-Disposition: attachment. When you access the object by using a browser, the browser detects that the Content-Disposition header is set to attachment. As a result, the object is downloaded. For more information about the x-oss-ec rules that are triggered when you access an object of a specific type in a bucket that is created at a specific point in time, see Appendix: x-oss-ec rules triggered for forcible download.

Use a custom domain name to access the object. Before you use a custom domain name, you must map the domain name to the bucket. For more information, see Map custom domain names.

The Content-Type value does not match the actual object type. In this case, the browser cannot parse or render the object correctly and can only download the object.

Modify the Content-Type header based on the object type. For more information, see How do I configure the Content-Type header?

The Content-Disposition header is set to attachment. In this case, the Content-Disposition: attachment header triggers the browser to download the object instead of displaying the object content.

Set the Content-Disposition header to inline. For more information, see Manage object metadata.

CDN

Resources cached on points of presence (POPs) are not refreshed.

Refresh resources cached on POPs. For more information, see Refresh and prefetch resources.

Browser

The file format is not supported for preview by your browser. For example, your browser may not support preview of XLS, DOC, PPT, or PDF files.

Install a plug-in for your browser to provide preview support for the preceding formats.