Failed to load API definition.

Environments

• Abp 3.8.1
• ASP.NET CORE

I have download Abp asp.net core with Vue template after run project web.host, in browser navigate to http://localhost:12021, I get the error on he swagger page.

Fetch errorFailed to fetch http://localhost:21021/swagger/v1/swagger.json Fetch errorPossible cross-origin (CORS) issue? The URL origin (http://localhost:21021) does not match the page (http://localhost:12021). Check the server returns the correct 'Access-Control-Allow-*' headers.

I checked the Startup.cs get nothing about CROS exception code.

    public IServiceProvider ConfigureServices(IServiceCollection services)
    {
        // MVC
        services.AddMvc(
            options => options.Filters.Add(new CorsAuthorizationFilterFactory(_defaultCorsPolicyName))
        );

        IdentityRegistrar.Register(services);
        AuthConfigurer.Configure(services, _appConfiguration);

        services.AddSignalR();

        // Configure CORS for angular2 UI
        services.AddCors(
            options => options.AddPolicy(
                _defaultCorsPolicyName,
                builder => builder
                    .WithOrigins(
                        // App:CorsOrigins in appsettings.json can contain more than one address separated by comma.
                        _appConfiguration["App:CorsOrigins"]
                            .Split(",", StringSplitOptions.RemoveEmptyEntries)
                            .Select(o => o.RemovePostFix("/"))
                            .ToArray()
                    )
                    .AllowAnyHeader()
                    .AllowAnyMethod()
                    .AllowCredentials()
            )
        );

        // Swagger - Enable this line and the related lines in Configure method to enable swagger UI
        services.AddSwaggerGen(options =>
        {
            options.SwaggerDoc("v1", new Info { Title = "Jifuwu API", Version = "v1" });
            options.DocInclusionPredicate((docName, description) => true);

            // Define the BearerAuth scheme that's in use
            options.AddSecurityDefinition("bearerAuth", new ApiKeyScheme()
            {
                Description = "JWT Authorization header using the Bearer scheme. Example: \"Authorization: Bearer {token}\"",
                Name = "Authorization",
                In = "header",
                Type = "apiKey"
            });
            // Assign scope requirements to operations based on AuthorizeAttribute
            options.OperationFilter<SecurityRequirementsOperationFilter>();
        });

        // Configure Abp and Dependency Injection
        return services.AddAbp<JifuwuWebHostModule>(
            // Configure Log4Net logging
            options => options.IocManager.IocContainer.AddFacility<LoggingFacility>(
                f => f.UseAbpLog4Net().WithConfig("log4net.config")
            )
        );
    }

    public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
    {
        app.UseAbp(options => { options.UseAbpRequestLocalization = false; }); // Initializes ABP framework.

        app.UseCors(_defaultCorsPolicyName); // Enable CORS!

        app.UseStaticFiles();

        app.UseAuthentication();

        app.UseAbpRequestLocalization();


        app.UseSignalR(routes =>
        {
            routes.MapHub<AbpCommonHub>("/signalr");
        });

        app.UseMvc(routes =>
        {
            routes.MapRoute(
                name: "defaultWithArea",
                template: "{area}/{controller=Home}/{action=Index}/{id?}");

            routes.MapRoute(
                name: "default",
                template: "{controller=Home}/{action=Index}/{id?}");
        });

        // Enable middleware to serve generated Swagger as a JSON endpoint
        app.UseSwagger();
        // Enable middleware to serve swagger-ui assets (HTML, JS, CSS etc.)
        app.UseSwaggerUI(options =>
        {
            options.SwaggerEndpoint(_appConfiguration["App:ServerRootAddress"] + "/swagger/v1/swagger.json", "Jifuwu API V1");
            options.IndexStream = () => Assembly.GetExecutingAssembly()
                .GetManifestResourceStream("Jifuwu.Web.Host.wwwroot.swagger.ui.index.html");
        }); // URL: /swagger
    }`

[ismcagdas]

@tairan I think I understand the problem. If you look at the error details there are two different urls; http://localhost:21021 http://localhost:12021

Probably this will fix your problem https://github.com/aspnetboilerplate/module-zero-core-template/pull/323

[tairan]

Yes, @ismcagdas you are right. it is fixed. thank you very much. 👍