Implement Content Security Policy in ASP.Net Core

Hi All,

I want implement Content security Policy in ASP.NET CORE 3.0 

Below code i am using but not succeeded  

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
    app.Use(async (context, next) => {
        context.Response.Headers.Add("Content-Security-Policy","default-src 'none'; script-src 'self'; connect-src 'self'; img-src 'self'; style-src 'self'");
    }
}

If anyone implemented in Projects pls Post here

This URL I used for Reference 

https://cheatsheetseries.owasp.org/cheatsheets/Content_Security_Policy_Cheat_Sheet.html 

Thank you