flask + MongoDB 学习笔记: Exceptions, Errors and Solutions

The browser (or proxy) sent a request that this server could not understand

异常原因：POST方法所需求的名字不在HTML里

e.g. <input name="title" type="text">entry_title = request.form['tit']

解决方案：名字保持一致

e.g.<input name="title" type="text">entry_title = request.form['title']

Method Not Allowed：The method is not allowed for the requested URL.

异常原因：HTML里 <form name="login" method="post"> post小写

解决方案：POST大写

'form' is not define

异常原因：return render_template('index.html') 没传入form

解决方案：return render_template('index.html', form=form)