gistfile1.txt

#!/usr/bin/python2

import flask
app = flask.Flask(__name__)

@app.route('/')                                                                                                                                                                                 
def hello_world():                                                                                                                                                                              
        r = flask.Response(status=304)                                                                                                                                                          
        r.headers['foo'] = 'bar'                                                                                                                                                                
        return r                                                                                                                                                                                
                                                                                                                                                                                                
if __name__ == '__main__':                                                                                                                                                                      
        app.run(debug=True)