Hard Hat

HardHat is a set of .net core middleware that adds various headers to help protect your site from vulnerablities. Inspired by helmetJS. Currently in beta, Content Security Policy, Unit tests, documentation due before 1.0.0. Netherless this should work fine.

In short this allows:

 // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
        {
            ...
            app.UseDnsPrefetch(allow: false); //turn off dns prefetch to protect the privacy of users
            app.UseFrameGuard(new FrameGuardOptions(FrameGuardOptions.FrameGuard.SAMEORIGIN)); //prevent clickjacking, by not allowing your site to be rendered in an iframe
            //  app.UseFrameGuard(new FrameGuardOptions("otherdomain.com")); or allow iframes on another domain
            app.UseHsts(maxAge: 5000, includeSubDomains: true, preload: false); //tell browsers to always use https for the next 5000 seconds
            app.UseReferrerPolicy(ReferrerPolicy.NoReferrer); // do not include the referrer header when linking away from your site to protect your users privacy
            app.UseIENoOpen(); // don't allow old ie to open files in the context of your site
            app.UseNoMimeSniff(); // prevent MIME sniffing https://en.wikipedia.org/wiki/Content_sniffing
            app.UseCrossSiteScriptingFilters(); //add headers to have the browsers auto detect and block some xss attacks
            ...
            app.UseMvc(routes =>
            {
                routes.MapRoute(
                    name: "default",
                    template: "{controller=Home}/{action=Index}/{id?}");
            });
        }
    }