from http.server import HTTPServer,BaseHTTPRequestHandler
import base64
png=base64.b64decode('iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mP8/x8AAwMCAO+jRZkAAAAASUVORK5CYII=')
class H(BaseHTTPRequestHandler):
 def do_GET(self):
  self.send_response(200);self.send_header('Content-Type','image/png');self.send_header('Content-Disposition','attachment; filename="dup.png"');self.end_headers();self.wfile.write(png)
HTTPServer(('0.0.0.0',8787),H).serve_forever()