Pure CGI: Generating Image on the fly

 1. BASH

#!/usr/bin/bash

echo -ne 'Content-Type: image/gif\r\n\r\n'

cat openbsd.gif

2. Python

#!/usr/bin/env python3

# HTTP header

import sys, os

print('Content-Type: image/gif\r\n\r\n', end='')

sys.stdout.flush()

img = open(r'openbsd.gif','rb')

data = img.read()

img.close()

out = os.fdopen(sys.stdout.fileno(), 'wb')

out.write(data)