在Flask应用程序中提交表单时，错误请求错误的原因是什么？

在阅读了许多类似的发音问题和相关的Flask文档之后，我似乎无法弄清楚提交表单后是什么导致了以下错误：

400错误的要求

浏览器（或代理）发送了该服务器无法理解的请求。

虽然表单始终可以正确显示，但是当我提交与以下两个功能之一关联的HTML表单时，就会发生错误的请求：

@app.route('/app/business', methods=['GET', 'POST'])

def apply_business():

if request.method == 'POST':

new_account = Business(name=request.form['name_field'], email=request.form['email_field'], account_type="business",

q1=request.form['q1_field'], q2=request.form['q2_field'], q3=request.form['q3_field'], q4=request.form['q4_field'],

q5=request.form['q5_field'], q6=request.form['q6_field'], q7=request.form['q7_field'],

account_status="pending", time=datetime.datetime.utcnow())

db.session.add(new_account)

db.session.commit()

session['name'] = request.form['name_field']

return redirect(url_for('success'))

return render_template('application.html', accounttype="business")

@app.route('/app/student', methods=['GET', 'POST'])

def apply_student():

if request.method == 'POST':

new_account = Student(name=request.form['name_field'], email=request.form['email_field'], account_type="student",

q1=request.form['q1_field'], q2=request.form['q2_field'], q3=request.form['q3_field'], q4=request.form['q4_field'],

q5=request.form['q5_field'], q6=request.form['q6_field'], q7=request.form['q7_field'], q8=request.form['q8_field'],

q9=request.form['q9_field'], q10=request.form['q10_field'],

account_status="pending", time=datetime.datetime.utcnow())

db.session.add(new_account)

db.session.commit()

session['name'] = request.form['name_field']

return redirect(url_for('success'))

return render_template('application.html', accounttype="student")

对于大多数人来说，问题不是呼叫GET或POST，而是我在两个函数中都这样做，并且再次检查以确保导入了所有必需的东西，例如from flask import request。我还查询了数据库，并确认未添加表单中的其他内容。