$ curl -s --head curl -s --head https://upload.wikimedia.org/wikipedia/commons/archive/8/87/20200821114029%21Venetian_seaside_properties_in_Montenegro_1448.png | grep -i Content-Type 
content-type: image/svg+xml

(commonswiki)> select * from image where img_name = 'Venetian_seaside_properties_in_Montenegro_1448.png'\G
...
    img_media_type: BITMAP
    img_major_mime: image
    img_minor_mime: png
...