Why doesn't 'fetch' image work sometimes?

The Smiling Pony
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Manually Breathing
@Stammis  
Because DeviantArt is a bad website.
 
More specifically in this case, DA requires a user to be logged in to be able to access any image flagged as “mature”. As this site isn’t a “user”, DA tells the image grabber to pound sand despite its purported oembed support.
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