Install-Package UrlFirewall.AspNetCore

public void ConfigureServices(IServiceCollection services)
{
 services.AddUrlFirewall(options =>
 {
  options.RuleType = UrlFirewallRuleType.Black;
  options.SetRuleList(Configuration.GetSection("UrlBlackList"));
  options.StatusCode = HttpStatusCode.NotFound;
 });
 services.AddMvc();
 //...
}

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
 //Configure url firewall middleware. Top most.
 app.UseUrlFirewall();

 if (env.IsDevelopment())
 {
  app.UseDeveloperExceptionPage();
 }
 app.UseMvc();
}

{
 "Logging": {
 "IncludeScopes": false,
 "LogLevel": {
  "Default": "Debug",
  "System": "Information",
  "Microsoft": "Information"
 }
 },
 "UrlBlackList": [
 {
  "Url": "/api/cart/add",
  "Method": "All"
 },
 {
  "Url": "/api/cart/del",
  "Method": "Post"
 },
 {
  "Url": "/api/cart/list",
  "Method": "Get"
 },
 {
  "Url": "/api/product/*",
  "Method": "All"
 }
 ]
}

services.AddUrlFirewall(options =>
{
 options.RuleType = UrlFirewallRuleType.Black;
 options.SetRuleList(Configuration.GetSection("UrlBlackList"));
 options.StatusCode = HttpStatusCode.NotFound;
}).AddUrlFirewallValidator<CustomValidator>();