SPA 默认页面中间件无法返回默认页面
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【中文标题】SPA 默认页面中间件无法返回默认页面【英文标题】：The SPA default page middleware could not return the default page 【发布时间】：2020-09-04 00:46:56 【问题描述】：我正在尝试构建我的项目，但出现此错误
处理请求时发生未处理的异常。 InvalidOperationException：“/index.html”，因为未找到它，并且没有其他中间件处理该请求。 Microsoft.AspNetCore.SpaServices.SpaDefaultPageMiddleware+c__DisplayClass0_0.b__1(HttpContext context, Func next)
我已经在各种网站上寻找解决方案，但我没有找到任何东西 我发现问题可能是
// angular.json ... “输出路径”：“dist” // 启动.cs ... spa.Options.SourcePath = "客户端应用"
但它不起作用
如果有人可以帮助我，这是我的代码
Startup.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.AspNetCore.SpaServices.AngularCli;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
namespace MYAPP.WebAPI
public class Startup
private const string corsName = "AllowOrigin";
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.AddCors(options =>
options.AddPolicy(corsName, builder =>
builder.AllowAnyOrigin()
.AllowAnyHeader()
.AllowAnyMethod();
);
);
services.AddMvc()
.SetCompatibilityVersion(CompatibilityVersion.Version_2_2)
.AddJsonOptions(options =>
options.SerializerSettings.DateFormatString = "yyyy'-'MM'-'dd'T'HH':'mm'Z'";
);
services.AddSpaStaticFiles(configuration =>
configuration.RootPath = "ClientApp";
);
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
if (env.IsDevelopment())
app.UseDeveloperExceptionPage();
app.UseCors(corsName);
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.UseStaticFiles();
app.UseSpaStaticFiles();
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";
// **************************************
// questa parte serve solo se si decide di creare un progetto unico WebAPI/Angular
//if (env.IsDevelopment())
//
// spa.UseAngularCliServer(npmScript: "start");
//
//**************************************
);
angular.json
"$schema": "./node_modules/@angular/cli/lib/config/schema.json",
"version": 1,
"newProjectRoot": "projects",
"projects":
"MYAPP":
"root": "",
"sourceRoot": "src",
"projectType": "application",
"prefix": "app",
"schematics":
"@schematics/angular:component":
"styleext": "scss"
,
"architect":
"build":
"builder": "@angular-devkit/build-angular:browser",
"options":
"outputPath": "dist",
"index": "src/index.html",
"main": "src/main.ts",
"polyfills": "src/polyfills.ts",
"tsConfig": "src/tsconfig.app.json",
"assets": [
"src/favicon.ico",
"src/assets"
],
"styles": [
"src/styles.scss"
],
"scripts": [],
"showCircularDependencies": false
,
"configurations":
"production":
"fileReplacements": [
"replace": "src/environments/environment.ts",
"with": "src/environments/environment.prod.ts"
],
"baseHref": "/MYAPP/",
"optimization": true,
"outputHashing": "all",
"sourceMap": false,
"extractCss": true,
"namedChunks": false,
"aot": true,
"extractLicenses": true,
"vendorChunk": false,
"buildOptimizer": true,
"budgets": [
"type": "initial",
"maximumWarning": "6mb",
"maximumError": "7mb"
]
,
"ec":
"sourceMap": true,
"extractCss": true
,
"hmr":
"fileReplacements": [
"replace": "src/environments/environment.ts",
"with": "src/environments/environment.hmr.ts"
]
,
"prod-hmr":
"fileReplacements": [
"replace": "src/environments/environment.ts",
"with": "src/environments/environment.prod-hmr.ts"
],
"baseHref": "/MYAPP/",
"optimization": true,
"outputHashing": "all",
"sourceMap": false,
"extractCss": true,
"namedChunks": false,
"aot": true,
"extractLicenses": true,
"vendorChunk": false,
"buildOptimizer": true,
"budgets": [
"type": "initial",
"maximumWarning": "6mb",
"maximumError": "7mb"
]
,
"serve":
"builder": "@angular-devkit/build-angular:dev-server",
"options":
"browserTarget": "MYAPP:build"
,
"configurations":
"production":
"browserTarget": "MYAPP:build:production"
,
"hmr":
"hmr": true,
"browserTarget": "MYAPP:build:hmr"
,
"ec":
"browserTarget": "MYAPP:build:ec"
,
"extract-i18n":
"builder": "@angular-devkit/build-angular:extract-i18n",
"options":
"browserTarget": "MYAPP:build"
,
"test":
"builder": "@angular-devkit/build-angular:karma",
"options":
"main": "src/test.ts",
"polyfills": "src/polyfills.ts",
"tsConfig": "src/tsconfig.spec.json",
"karmaConfig": "src/karma.conf.js",
"styles": [
"src/styles.scss"
],
"scripts": [],
"assets": [
"src/favicon.ico",
"src/assets"
]
,
"lint":
"builder": "@angular-devkit/build-angular:tslint",
"options":
"tsConfig": [
"src/tsconfig.app.json",
"src/tsconfig.spec.json"
],
"exclude": [
"**/node_modules/**"
]
,
"MYAPP-e2e":
"root": "e2e/",
"projectType": "application",
"prefix": "",
"architect":
"e2e":
"builder": "@angular-devkit/build-angular:protractor",
"options":
"protractorConfig": "e2e/protractor.conf.js",
"devServerTarget": "MYAPP:serve"
,
"configurations":
"production":
"devServerTarget": "MYAPP:serve:production"
,
"lint":
"builder": "@angular-devkit/build-angular:tslint",
"options":
"tsConfig": "e2e/tsconfig.e2e.json",
"exclude": [
"**/node_modules/**"
]
,
"defaultProject": "MYAPP"
【问题讨论】：
【参考方案1】：这困扰了我几个小时，我终于注意到我的应用程序中有一个愚蠢的错字。就我而言，该错误与服务器端配置无关（如spa.Options.SourcePath = "ClientApp" 或ClientApp\dist）。
这是由于我的 Angular 应用程序用来调用控制器方法的 API url 中的尾部斜杠。
代替
http://localhost:81 // Correct
我有
http://localhost:81/ // Trailing slash is not needed.
如果您仔细查看浏览器控制台中的错误，您可以看到带有两个连续斜杠的路径。
【讨论】：
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