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David Mudrák authored
If for any reason the preview image can't be generated for the given file (eg we do not support its mimetype yet), the function will send 404 Not Found HTTP header. This will be useful for the lazy loading of the file thumbnails as the JavaScript will simply ignore such response and will not replace the default icon for the file. In the future, a fallback thumbnail generator can be implemented that would generate some sort of default preview for all files (eg using the mimetype icon like some desktop OS do).
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