Puneeth Chaganti 59555ee7e5 url preview: Confirm content-type before trying to show previews. ...

Currently, we only show previews for URLs which are HTML pages, which could
contain other media. We don't show previews for links to non-HTML pages, like
pdf documents or audio/video files. To verify that the URL posted is an HTML
page, we verify the content-type of the page, either using server headers or by
sniffing the content.

Closes #8358

2019-05-13 13:45:17 -07:00

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