added cors and added produces json.

Demo/Startup.cs

@@ -74,6 +74,7 @@ namespace Demo
             services.AddPoweredSoftGraphQLFluentValidation();
 
             services.AddSwaggerGen();
+            services.AddCors();
         }
 
         private void AddDynamicQueries(IServiceCollection services)
@@ -113,6 +114,8 @@ namespace Demo
 
             app.UseHttpsRedirection();
 
+            app.UseCors(o => o.AllowAnyOrigin().AllowAnyHeader().AllowAnyMethod());
+
             app.UseRouting();
 
             app.UseAuthorization();

PoweredSoft.CQRS.AspNetCore/Mvc/CommandController.cs

@@ -7,6 +7,7 @@ using System.Threading.Tasks;
 
 namespace PoweredSoft.CQRS.AspNetCore.Mvc
 {
+    [Produces("application/json")]
     [ApiController, Route("api/command/[controller]")]
     public class CommandController<TCommand> : Controller
         where TCommand : class
@@ -23,6 +24,7 @@ namespace PoweredSoft.CQRS.AspNetCore.Mvc
         }
     }
 
+    [Produces("application/json")]
     [ApiController, Route("api/command/[controller]")]
     public class CommandController<TCommand, TTCommandResult> : Controller
         where TCommand : class

PoweredSoft.CQRS.AspNetCore/Mvc/QueryController.cs

@@ -7,6 +7,7 @@ using System.Threading.Tasks;
 
 namespace PoweredSoft.CQRS.AspNetCore.Mvc
 {
+    [Produces("application/json")]
     [ApiController, Route("api/query/[controller]")]
     public class QueryController<TQuery, TQueryResult> : Controller
         where TQuery : class