关于python：Flask Message Flashing错误 – flask.debughelpers.FormDataRoutingRedirect

Flask Message Flashing error - flask.debughelpers.FormDataRoutingRedirect

运行烧瓶代码时，当前出现以下错误：

flask.debughelpers.FormDataRoutingRedirect
- FormDataRoutingRedirect: A request was sent to this URL (http://localhost:5000/login) but a redirect was issued automatically by the routing system to"http://localhost:5000/login/". The URL was defined with a trailing slash so Flask will automatically redirect to the URL with the trailing slash if it was accessed without one. Make sure to directly send your POST-request to this URL since we can't make browsers or HTTP clients redirect with form data reliably or without user interaction.

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我认为这与消息闪烁的位置有关，但我似乎不知道如何解决这个问题。我对烧瓶不太熟悉，所以不完全确定解决这个问题的最佳选择是什么。

我已经包含了index.py和login.html文件来帮助重现这个错误。提前感谢您的帮助！：)

app.py的登录部分

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@app.route('/login/', methods=['GET', 'POST'])
def login():
form = LoginForm()

if form.validate_on_submit():
user = User.query.filter_by(username=form.username.data).first()
if user:
if check_password_hash(user.password, form.password.data):
login_user(user, remember=form.remember.data)
flash("Invalid username or password")
return redirect(url_for('dashboard'))

return render_template('login.html', form=form, errors=form.errors.items())

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{% block body_content %}

<form method="POST" action="/login">
{{ form.csrf_token }}

{{ form.username }}

{{ form.password }}

{{ form.remember }}

<button type="submit" class="btn btn-primary">Sign In</button>
</form>

{% for field, err in errors %}
<p>
{{field}} : {{err|join(', ')}}
</p>
{% endfor %}

{% for message in get_flashed_messages() %}
{{ message }}
{% endfor %}

{% endblock %}

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按照消息中的建议，在表单内的action属性中添加一个尾随斜杠：

1	<form method="POST" action="/login/">

最好使用url_for来构建URL：

1	<form method="POST" action="{{ url_for('login') }}">

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由于您使用处理日志的相同视图呈现表单，因此可以省略action。

1	<form method="POST">