Free Lossless Image Format

import magic
# Libmagic will identify FLIF files via their magic byte header
print(magic.from_file('archive.flif', mime=True)) # Outputs 'image/flif'

const FileType = require('file-type');
const type = await FileType.fromFile('archive.flif');
console.log(type?.mime); // Outputs 'image/flif'

import (
    "bytes"
    "net/http"
)
// Standard http.DetectContentType will not recognize FLIF and returns application/octet-stream.
// Custom detection:
// isFLIF := bytes.HasPrefix(buf, []byte("FLIF"))

$mime = mime_content_type('archive.flif');
echo $mime; // Standard setups may output 'application/octet-stream' depending on the server's magic database