首页 > 解决方案 > 使用单页应用程序 (Spa) 预呈现未通过 IIS AspNetCoreModule 返回正确的 URL 路径

问题描述

我已经设法使用 .NET Core Prerendering 设置了一个单页应用程序 Angular 项目,并且可以确认 Angular 应用程序在服务器端和客户端都可以工作。

我正在使用在生产模式下构建的 AspNetCoreModule 处理程序在 IIS 10 中运行应用程序。同样,我可以确认这是有效的。

每次重新加载页面时,我对 SpaPrendering 上下文中返回的内容有疑问,尤其是相对路径。它总是返回 /index.html,而不是浏览器中的相对路径。

我已经在 Visual Studio 的 IIS Express 中尝试过这个,并且相对路径返回了正确的结果。所以它似乎与 IIS 隔离并使用 AspNetCoreModule 处理程序。

public class Program
{
    public static void Main(string[] args)
    {
            CreateWebHostBuilder(args).Build().Run();

    }

    public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
        WebHost.CreateDefaultBuilder(args).UseKestrel(options =>
        {
            options.Listen(IPAddress.Loopback, 5443); //HTTP port               
        })
            .UseStartup<Startup>();
}


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.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);

        // In production, the Angular files will be served from this directory
        services.AddSpaStaticFiles(configuration =>
        {
            configuration.RootPath = "ClientApp/dist/ClientApp";
        });

        services.AddDbContext<DevResourceDbContext>(options => options.UseSqlServer(Configuration.GetConnectionString("DevResourceDbContext")));

        services.AddScoped<ImageService>();
        services.AddScoped<EnquiryService>();
        services.AddScoped<CategoryService>();

        services.AddSingleton<RouteBackgroundService>();

        // Mapping
        services.AddAutoMapper();
    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        try
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                //app.UseExceptionHandler("/Error");
                //app.UseHsts();                      
            }


            //app.UseHttpsRedirection();
            app.UseStaticFiles();                
            app.UseSpaStaticFiles();
            app.UseRewriter(new RewriteOptions().AddRedirect("index.html", "/"));

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

            app.UseSpa(spa =>
            {
            // To learn more about options for serving an Angular SPA from ASP.NET Core,
            // see https://go.microsoft.com/fwlink/?linkid=864501

                spa.Options.SourcePath = "ClientApp";


                spa.UseSpaPrerendering(options =>
                {
                // If not working, make sure that npm install and npm install @angular-devkit/build-webpack have been ran.
                options.BootModulePath = $"ClientApp/dist-server/ClientApp/main.js";
                    options.BootModuleBuilder = env.IsDevelopment()
                        ? new AngularCliBuilder(npmScript: "build:ssr")
                        : null;
                    options.ExcludeUrls = new[] { "/sockjs-node" };

                    options.SupplyData = (context, data) =>
                    {

                        var routeBackgroundService = context.RequestServices.GetRequiredService<RouteBackgroundService>();
                        data["routes"] = JsonConvert.SerializeObject(new { Paths = routeBackgroundService.GetRouteData() }, Formatting.Indented);

                        // context.Request.Path always returns index.html, even if 
                        GetSupplyData(context, new Uri(string.Format("{0}://{1}{2}{3}", context.Request.Scheme, context.Request.Host, context.Request.Path, context.Request.QueryString)), data);
                    };
                });



                spa.Options.StartupTimeout = new System.TimeSpan(0, 3, 0);

                if (env.IsDevelopment())
                {
                    spa.UseAngularCliServer(npmScript: "start");
                }
            });
        }
        catch (Exception ex)
        {

            throw ex;
        }
    }

    protected void GetSupplyData(HttpContext context, Uri uri, IDictionary<string, object> data)
    {
        var routeBackgroundService = context.RequestServices.GetRequiredService<RouteBackgroundService>();

        var path = uri.AbsolutePath;

        // Remove forward slash from path.
        if (path.Length > 0 && path.Substring(0, 1) == "/")
        {
            path = path.Substring(1, path.Length - 1);
        }

        // Does the path match a category?
        var selectedCategory = routeBackgroundService.GetCategory(path);

        if (selectedCategory != null)
        {
            data["selectedCategory"] = Map(context, selectedCategory);

            // Filter the image categories
            var imageCategories = routeBackgroundService.GetImageCategoryByCategory(selectedCategory.Id);

            // Now get the images.
            var images = routeBackgroundService.GetImageByCategory(imageCategories).Select(s => Map(context, s)).ToList();

            if (images != null)
            {
                data["images"] = JsonConvert.SerializeObject(new PageList<Image>(images, uri, uri.ToPageNumber() ?? 1, 12, 5), Formatting.Indented);
            }
        }

        // Ensure all querystring are added to the data.
        var queryData = System.Web.HttpUtility.ParseQueryString(uri.Query);

        foreach (var q in queryData.AllKeys)
        {
            data["querystring_" + q] = queryData[q];
        }
    }

    protected Image Map(HttpContext context, ImageEntity entity)
    {
        var mapper = context.RequestServices.GetRequiredService<IMapper>();

        return mapper.Map<ImageEntity, Image>(entity);
    }

    protected Category Map(HttpContext context, CategoryEntity entity)
    {
        var mapper = context.RequestServices.GetRequiredService<IMapper>();

        return mapper.Map<CategoryEntity, Category>(entity);
    }
}

在 StartUp 类中,有一个 Configure void。在 Configure void 中,有一个 app.UseSpa,您可以在其中配置选项。在 app.UseSpa 中,我使用的是 spa.UsePreRendering。

从服务器加载页面时,它会通过 spa.UsePrerendering 中的 options.SupplyData 运行。options.SupplyData 中的参数之一是 HttpContext 类型的上下文。

但是,当从服务器加载页面时,context.Request.Path 总是返回 index.html,而不管在浏览器中输入的路径如何。因此,如果我输入http://domain/test,我希望 context.Request.Path 显示 /test,但它总是返回 /index.html。我猜它这样做是因为 Angular 应用程序的默认 HTML 页面是 /index.html。

这只发生在使用 AspNetCoreModule 的 IIS 10 中,而不是在 Visual Studio 中使用 IIS Express。

标签: angular.net-coreasp.net-core-2.0single-page-applicationiis-10

解决方案


为了使客户端路由工作,ASP.NET 应该为所有请求返回 index.html,无论实际路径是什么。否则,我们会收到 404 错误。但是对于预渲染的应用程序,我们确实拥有所有需要的 index.html 文件。

因此,而不是使用

    services.AddSpaStaticFiles(configuration =>
    {
        configuration.RootPath = "ClientApp/dist/ClientApp";
    });

您可以尝试在 public void 中手动设置静态文件路由

Configure(IApplicationBuilder app, IHostingEnvironment env): {
...
}

客户端应用程序的路径:

var fileProvider = new PhysicalFileProvider(
        Path.Combine(Directory.GetCurrentDirectory(), "ClientApp", "dist", "ClientApp"));

我们还需要告诉我们的提供者,当我们有斜线结尾但没有指定确切的文件名index.html时应该提供服务。/

    var defOptions = new DefaultFilesOptions();
    defOptions.FileProvider = fileProvider;
    app.UseDefaultFiles(defOptions);

现在我们应该告诉 SPA 文件应该是使用我们的提供者处理所有请求的服务器。(如果有现有的控制器或 Web API 请求,它们就可以正常工作)

    app.UseStaticFiles(new StaticFileOptions
    {
        FileProvider = fileProvider,
        RequestPath = new PathString("")
    });

推荐阅读