POST /api/images -> 500
{"error":"Internal Server Error"}
upload 'tihany-levendula.png' -> 500 {"id": null, "image": null}
upload 'tihany-levendula-árvíztűrő.png' -> 500 {"id": null, "image": null}
--- curl -F upload with header 'Transfer-Encoding: chunked' ---
500
--- curl -F upload with header 'X-none: 1' ---
500
