前端页面 ajax运行报错Failed to load resource: the server responded with a status of 405 ()

Question

前端：html5（vs code环境下编写 没用框架）
后端：python flak框架写的接口
数据库：SQL server
问题：简单的登录页面，输入正确的用户名和密码之后，点击登录报错：Failed to load resource: the server responded with a status of 405 ()
后端接口提示：
"OPTIONS /api/login?user=admin&passwd=LCQHWaOtpk8%3D HTTP/1.1" 200 -
"GET /api/login?user=admin&passwd=LCQHWaOtpk8%3D HTTP/1.1" 200 -

搜了百度，405应该是跨域问题，用了一位网友的方法，但是没有解决，还是405

from flask_cors import *
app = Flask(__name__)
CORS(app, supports_credentials=True, resource=r'/*')

前端ajax代码：

  $.ajax({
              type:"GET",     
              url:"http://192.168.8.241:8888/api/login",        
              data:{"user":$('#username').val(),"passwd":$('#password').val()},
              dataType:'json',          
              success:function(resu){ //服务器（接口）返回来的数据             
                if(typeof(resu.msg) =="success"){
                  window.location.href="index.html"
                  window.event.returnValue=false;                             
                }
                if(typeof(resu.msg)=="fail"){
                  alert("登录失败！");
                }
              },          
              error:function(XMLHttpRequest,textStatus,thrownError){
              }
            });

后端 login.py代码

@app.route("/api/login",methods=["get"])
def login():
    """登录页：用户名密码"""
    username = str(request.values.get("user"))
    password = str(request.values.get("passwd"))

    sql = "SELECT * FROM fp.dbo.users WHERE userm='"+username+"'and userpwd='"+password+"'"
    data = ssql_operate.db.select_db(sql)
    if data:
        resu = {'code': 200, 'msg': 'success','token':'135456784'}   
        return json.dumps(resu, ensure_ascii=False)
    else:
        resu ={'code': -1, 'msg': 'fail'}
        return json.dumps(resu, ensure_ascii=False)

Answer 1

CORS(app , supports_credentials=True, resource=r'/*')
把, supports_credentials=True去掉试试，我这测试加这个配置flask没有发送下面的响应头

Access-Control-Allow-Origin: *