A file called reaction.gif can still contain MP4 video. This matters in upload widgets: choosing an <img> solely from the filename can produce a broken preview, while accepting the file as a verified image can mislead later processing. A short header check can improve the error message before the application hands the bytes to a real... Weiterlesen: Detect a GIF file before choosing its browser preview
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Detect a GIF file before choosing its browser preview
A file called reaction.gif can still contain MP4 video. This matters in upload widgets: choosing an solely from the filename can produce a broken preview,…
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