我尝试使用Identity Server 4实现授权代码流，但当我尝试生成授权代码时，我得到的只是一个一般错误页面，除了消息“对不起，出现错误”（标题为“错误”）之外什么都没有。
无论是使用Postman还是以编程方式提交带有所需参数的GET请求，我都会得到这个结果。
为了运行我的测试，我在Visual Studio中启动了标识服务器和API服务器。我启动了MVC站点，以便在需要时以测试用户身份登录，并使回调URL可用。然后我在Postman中按下了“获取新的访问令牌”按钮。结果是出现了该一般性错误。
我知道，当我以编程方式提交GET请求时，响应应该是Auth Code，这是理想的，但此时我只想成功地验证客户端。
有人能看到我遗漏的东西吗？
在Postman中，我的参数如下所示：

我的客户端设置如下：

new Client
            {
                ClientId = "mvc",
                ClientSecrets = { new Secret("secret".Sha256()) },

                AllowedGrantTypes = GrantTypes.Code ,

                // where to redirect to after login
                RedirectUris = { "https://localhost:5002/signin-oidc" },

                // where to redirect to after logout
                PostLogoutRedirectUris = { "https://localhost:5002/signout-callback-oidc" },

                AllowOfflineAccess = true,
                AllowAccessTokensViaBrowser = true,

                AllowedScopes = new List<string>
                {
                    IdentityServerConstants.StandardScopes.OpenId,
                    IdentityServerConstants.StandardScopes.Profile,
                    "api1",
                    IdentityServerConstants.StandardScopes.Email
                }
            }

我的测试用户是Identity Server Github代码附带的用户：

new TestUser
                {
                    SubjectId = "88421113",
                    Username = "bob",
                    Password = "bob",
                    Claims =
                    {
                        new Claim(JwtClaimTypes.Name, "Bob Smith"),
                        new Claim(JwtClaimTypes.GivenName, "Bob"),
                        new Claim(JwtClaimTypes.FamilyName, "Smith"),
                        new Claim(JwtClaimTypes.Email, "BobSmith@email.com"),
                        new Claim(JwtClaimTypes.EmailVerified, "true", ClaimValueTypes.Boolean),
                        new Claim(JwtClaimTypes.WebSite, "http://bob.com"),
                        new Claim(JwtClaimTypes.Address, JsonSerializer.Serialize(address), IdentityServerConstants.ClaimValueTypes.Json)
                    }
                }

我的Identity Server启动：

public class Startup
{
    public IWebHostEnvironment Environment { get; }

    public Startup(IWebHostEnvironment environment)
    {
        Environment = environment;
    }

    public void ConfigureServices(IServiceCollection services)
    {
        // uncomment, if you want to add an MVC-based UI
        services.AddControllersWithViews();

        services.AddAuthentication()
            .AddGoogle("Google", options =>
            {
                options.SignInScheme = IdentityServerConstants.ExternalCookieAuthenticationScheme;

                options.ClientId = "<insert here>";
                options.ClientSecret = "<insert here>";
            });

        services.AddAuthentication(IdentityServerAuthenticationDefaults.AuthenticationScheme)
            .AddIdentityServerAuthentication (options =>
            {
                options.Authority = "https://localhost:5001";
                options.ApiName = "testapis";
            });

        var builder = services.AddIdentityServer(options =>
        {
            // see https://identityserver4.readthedocs.io/en/latest/topics/resources.html
            options.EmitStaticAudienceClaim = true;
        })
        .AddDeveloperSigningCredential()        //This is for dev only scenarios when you don’t have a certificate to use.
        .AddInMemoryIdentityResources(Config.IdentityResources)
        .AddInMemoryApiScopes(Config.ApiScopes)
        .AddInMemoryClients(Config.Clients)
        .AddTestUsers(TestUsers.Users)
        .AddCustomTokenRequestValidator<CustomTokenRequestValidator>();

        // not recommended for production - you need to store your key material somewhere secure
        builder.AddDeveloperSigningCredential();
    }

    public void Configure(IApplicationBuilder app)
    {
        if (Environment.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }
        app.UseHttpsRedirection();
        //// uncomment if you want to add MVC
        app.UseStaticFiles();
        app.UseRouting();

        app.UseIdentityServer();
        app.UseAuthentication();

        //// uncomment, if you want to add MVC
        app.UseAuthorization();
        app.UseEndpoints(endpoints =>
        {
            endpoints.MapDefaultControllerRoute();
        });
    }
}