jquery – 在flask中检查request.method时出错

我目前正在学习Flask.

使用jQuery通过$.ajax()发送数据后,键入=’post’,当我检查request.method时,服务器端出错. type =’get’也是如此.

错误

builtins.ValueError
ValueError: View function did not return a response

Traceback (most recent call last)
  File "C:\Python33\lib\site-packages\flask\app.py",line 1836,in __call__
    return self.wsgi_app(environ,start_response)
  File "C:\Python33\lib\site-packages\flask\app.py",line 1820,in wsgi_app
    response = self.make_response(self.handle_exception(e))
  File "C:\Python33\lib\site-packages\flask\app.py",line 1403,in handle_exception
    reraise(exc_type,exc_value,tb)
  File "C:\Python33\lib\site-packages\flask\_compat.py",line 33,in reraise 
    raise value 
  File "C:\Python33\lib\site-packages\flask\app.py",line 1817,in wsgi_app
    response = self.full_dispatch_request()
  File "C:\Python33\lib\site-packages\flask\app.py",line 1478,in full_dispatch_request
    response = self.make_response(rv)
  File "C:\Python33\lib\site-packages\flask\app.py",line 1566,in make_response
    raise ValueError('View function did not return a response')
ValueError: View function did not return a response

python代码

if request.method=='psot': #**Error occur when i check**
    req = request.get_json()
    ck=query_db("select * from users where username=?",[req['u']])
    if ck:
        if check_password_hash(ck[0]['password'],req['p']):
            session['username']=req['u']
            return jsonify({'result':'1234'})
        else:
            return jsonify({'result':'noo'})
    else:
            return jsonify({'result':'noo'})

jQuery的

$.ajax({
    type:'post',contentType: 'application/json',url:"/login",data:JSON.stringify({'u':luser.val(),'p':lpass.val()}),dataType:'json',success:function(data)
    {
        if(data.result=='1234')
        {
            window.location.href='/profile';
        }
        else
        {
            $('#log3s').html('username or password not correct').css('color','red');
            return false;
        }
    }
});

解决方法

您需要确保使用正确的方法注册视图路径：

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

允许GET和POST请求,或使用：

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

仅允许此路线的POST.

要测试请求方法,请使用大写文本进行测试：

if request.method == 'POST':

但请确保您始终返回回复.如果request.method不等于’POST’,你仍然需要返回valid response.