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gbj_tester
The correct mimetype should be sent regardless of the file extension.
Jpgs are also auto converted to webp for clients that support webp, and yet this is done without a redirect so the file extension remains intact.
We also don't trust that something that calls itself a jpg is an image. So regardless of file extension, we want to make sure an exe isn't uploaded containing malware, so every image is inspected, and during that we may adjust the mimetype.