Post and image, as in the following examples.

curl -i -X POST -H "Content-Type: multipart/form-data" -F "file=@myimage.jpg" -F "username={username}" -F "password={password}" -F "langid={selected lang}" 'http://services.athenarc.gr:5000/advent/api'

• file: Must be "png" or "jpg" and 320 < width < 512 px (keep the aspect ratio)
• username: "A username for the request"
• password: "A password for the request"
• langid: User language: "el" or "en"