The \\\'Access-Control-Allow-Origin\\\' header contains multiple values \\\'http://localhost:5000, *\\\', but only one is allowed. Origin \\\'http://localhost:5000\\\' is therefore notallowed access.

在iis中父级和子应用同时配置了Access-Control-Allow-Origin = * 响应头。删除任意一个配置就可以了。