Getting Response of Type cors on web api .net core

Question

I'm just trying to return a url to a client i already did all configuration of cors policy but the only return i recieve is of type cors, without any signal of the url that i want to return, the preflight request works fine and the request itself either, the return of my api its my problem.

this is my startup.cs

 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.AddTransient<ITokenManager, TokenManager>();
            services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
            services.AddSingleton<IAccountService, AccountService>();
            services.AddSingleton<ITableauService, TableauService>();


            services.AddCors(options =>
            {
                options.AddPolicy("AllowAll",
                    builder =>
                    {
                        builder
                        .AllowAnyOrigin()
                        .AllowAnyMethod()
                        .AllowAnyHeader()
                        .Build();

                    });
            });

            services.Configure<MvcOptions>(options =>
            {
                options.Filters.Add(new CorsAuthorizationFilterFactory("AllowAll"));
            });

            services.AddMvc();

        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {

            app.UseAuthentication();
            app.UseCors("AllowAll");
            app.UseMvc();
            app.UseStaticFiles();
            app.UseCookiePolicy();

            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseExceptionHandler("/Error");
                app.UseHsts();
            }
        }
    }

fetch api request from client

  fetch('https://baseurl?folder=AcompanhamentoComparativoLocaliza&view=DashEmails'
            , {

                headers: new Headers({
                    'authorization': 'AuthToken',
                    'Content-Type':'application/json',

                })
            })
                .then(response => {
                    console.log('teste',response)


                }
                )
                .catch(error => console.error(error))

this is the output of cors policy, as you guys can see they are executed sucessfully

this is the return in my controller

and now the network in my client

preflight network headers and status

Request itself

response from the api

Thanks in advance, i apreaciate any help.

Answer 1

Response type is cors means

Response was received from a valid cross-origin request. Certain headers and the body may be accessed.

So just get the returned data using :

.then(response => {
  response.json().then((data) => {
      console.log(data);
    })
  }
)

In addition , if you want to return url , you should add double quotes ,for example :

return Content("\"https://localhost:8080\"");