Core API and CORS Problem?

[zBestDataLLC]

I have been dealing with what appears to be a CORS issue. The code below works, but only if "Content-Type: 'application/json'" is added to the header on the client side. I would prefer not to do this because it would require the customers to make the updates to their code.
Everything I have read says the modifications in the Startup.cs file should allow me to process with out having to modify the post header, but the Application seams to be ignoring it. Per some other recommendations, I have also added Microsoft.AspNetCore.cors from NuGet. But no success. What am I missing?


using System.Collections.Generic;
using dbzBest.Models;
using Microsoft.AspNetCore.Mvc;

namespace zpmAPI.Controllers
{
[Route("api/[controller]/[action]")]
[ApiController]
[Consumes("application/json")]
public class PropertyController : ControllerBase
{
[HttpPost]
public List<PropertyTile> Search(PropertySearch s)
{
try
{
List<PropertyTile> tiles = new List<PropertyTile>();
dbzBest.Data.Properties db = new dbzBest.Data.Properties();
tiles = db.Search(s);
return tiles;
}
catch (System.Exception ex)
{
PropertyTile e = new PropertyTile();
e.Description = ex.Message;
List<PropertyTile> error = new List<PropertyTile>();
error.Add(e);
return error;
}
}
}
}


using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;

namespace zpmAPI
{
public class Startup
{
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}

public IConfiguration Configuration { get; }

// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
services.AddCors();
services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
}

// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
else
{
// The default HSTS value is 30 days. You may want to change this for production scenarios, see Enforce HTTPS in ASP.NET Core.
app.UseHsts();
}

app.UseCors(opt => opt.AllowAnyOrigin().AllowAnyHeader().AllowAnyMethod());
app.UseHttpsRedirection();
app.UseMvc();
}
}
}

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