Python Flask 自定义404错误

from flask import Flask, abort, make_response, request, render_template

app = Flask(__name__)


# 重定向到百度
@app.route('/index', methods=["GET", "POST"])
def index():
    if request.method == "GET":
        return render_template("index.html")
    if request.method == "POST":
        name = request.form.get('name')
        password = request.form.get('password')
        if name == 'zhangsan' and password == '123':
            return '登录成功'
        else:
            abort(404)


@app.errorhandler(404)
def handle_404_error(err):
    return "出现了404错误 错误信息是%s" % err


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