问CORS Net Core 3.1

EN

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Mail;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.EntityFrameworkCore;
using IDCA.Models;

namespace IDCA
{
 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)
    {
        // Add CORS policy
        services.AddCors(
          options => options.AddPolicy("foo",
          builder => builder.AllowAnyOrigin()
          .AllowAnyHeader()
          .AllowAnyMethod()
          )
       );


        services.AddDbContext<TodoContext>(options =>
               options.UseSqlServer(Configuration.GetConnectionString("RazorPagesMovieContext")));
        services.AddControllers();

        services.AddScoped<SmtpClient>((serviceProvider) =>
        {
            var config = serviceProvider.GetRequiredService<IConfiguration>();
            return new SmtpClient()
            {
                Host = config.GetValue<String>("Email:Smtp:Host"),
                Port = config.GetValue<int>("Email:Smtp:Port"),
                Credentials = new NetworkCredential(
                        config.GetValue<String>("Email:Smtp:Username"),
                        config.GetValue<String>("Email:Smtp:Password")
                    )
            };
        });
        services.AddMvc();

        services.AddRazorPages();
    }

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

        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }
        else
        {
            app.UseExceptionHandler("/Error");
            // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
            app.UseHsts();
        }

        app.UseHttpsRedirection();

        app.UseDefaultFiles();
        app.UseStaticFiles();

        app.UseRouting();
        // Use the CORS policy
        app.UseCors("foo");

        app.UseAuthorization();

        app.UseEndpoints(endpoints =>
        {
            endpoints.MapRazorPages();
            endpoints.MapControllers();
        });
    }
}