How to get the content type of a file from a redirecting page?

如何从一个重定向页面获取文件内容类型？

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Use this page to add a file type to include in the content index.

目录索引catalogue inde x例句使用此页面可向目录索引中添加文件类型。

youdao

Use this page to add a file type to include in the content index.

目录索引catalogue inde x例句使用此页面可向目录索引中添加文件类型。

youdao