from flask import send_file
@app.route('/get_image')
def get_image():
if request.args.get('type') == '1':
filename = 'ok.gif'
else:
filename = 'error.gif'
return send_file(filename, mimetype='image/gif')
<img src="{{url_for('static', filename='MD.png')}}">
<image src="{{url_for('static',filename = 'images/download.jpg')}}" >