It appears since the server move, the API broke a bit. All the url's are missing the HTTPS: at the begining.

For example:
file_url="//konachan.com/image/d4ff8984d213276f2dce308e27eb4b35/Konachan.com%20-%20232657%20braids%20hyperdimension_neptunia%20kazenokaze%20purple_heart%20sky%20thighhighs%20wings.png"