from flask import Flask,make_response,redirect,abort

app = Flask(__name__)

@app.route('/index1')

def index1():

    return make_response('<h1>Bad Request</h1>', 400)

@app.route('/index2')

def index2():

    return '<h1>Bad Request</h1>', 400

@app.route('/index3')

def index3():

    return redirect('http://www.baidu.com')


@app.route('/index4')

def index4():

    return abort(404)

if __name__ == '__main__': app.run(debug=True)