Question

我不确定，一旦输入用户名，为什么页面会重定向到/ index路由

from flask import Flask, session, redirect, url_for, request
from markupsafe import escape

app = Flask(__name__)

# Set the secret key to some random bytes. Keep this really secret!
app.secret_key = b'_5#y2L"F4Q8z\n\xec]/'

@app.route('/index')
def index():
    if 'username' in session:
        return 'Logged in as %s' % escape(session['username'])
    return 'You are not logged in'

@app.route('/login', methods=['GET', 'POST'])
def login():
    if request.method == 'POST':
        session['username'] = request.form['username']
        return redirect(url_for('index'))
    return '''
        <form method="post">
            <p><input type=text name=username>
            <p><input type=submit value=Login>
        </form>
    '''

@app.route('/logout')
def logout():
    # remove the username from the session if it's there
    session.pop('username', None)
    return redirect(url_for('index'))

代码来自flask的快速入门文档

Answer 1

实际上，@ monsieuralfonse64已经给出了答案，所以我只作总结。

由于您的表单设置了method="post"属性：

@app.route('/login', methods=['GET', 'POST'])
def login():
    # ...
    return '''
        <form method="post">
            <p><input type=text name=username>
            <p><input type=submit value=Login>
        </form>
    '''

提交表单时，浏览器将以POST方法发送数据，这就是为什么它触发if request.method == 'POST':语句，然后执行return redirect(url_for('index'))的原因，最后页面重定向到/index。

在烧瓶中重定向

1 个答案: