fix: use resizable image MIME types in Accept header for external image fetch #5599
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…ge fetch When pasting HTML with external image URLs (e.g. Unsplash with auto=format), the server fetched images with an Accept header including image/avif. Services performed content negotiation and served AVIF data, which Cloudflare Image Resizing cannot process as input, causing ERROR 9520. Add RESIZABLE_IMAGE_MIME_TYPES whitelist limited to Cloudflare-supported input formats (JPEG, PNG, GIF, WebP, SVG) and use it in the Accept header.
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Description
When pasting HTML containing external image URLs (e.g. from Tailwind UI components), the server fetches those images with an
Acceptheader that includesimage/avif. Services like Unsplash that supportauto=formatperform content negotiation based on this header and serve AVIF data. Cloudflare Image Resizing cannot process AVIF as input, resulting in ERROR 9520: Original image has unsupported format.This PR adds a
RESIZABLE_IMAGE_MIME_TYPESwhitelist in the SDK containing only formats that Cloudflare Image Resizing supports as input (JPEG, PNG, GIF, WebP, SVG), and uses it in theAcceptheader when fetching external images during paste.Direct file uploads are unaffected — users can still upload AVIF files, which are stored as-is.
Reference: https://developers.cloudflare.com/images/transform-images/#supported-input-formats
Steps for reproduction
ERROR 9520: Original image has unsupported formatCode Review
Before requesting a review
Before merging
RESIZE_ORIGIN).envfile