C# 为什么Asp.Net核心Kestrel服务器将404返回给Ngrok，而控制器从未被调用？

几天来，我一直在尝试运行一个简单的asp.net核心应用程序，并为Telegrame bot安装webhook。它在Mac上运行，有Kestrel服务器，Ngrok在上面代理https到webhook。目前，它返回404到Ngrok，我也在控制台中看到404。感谢您的帮助。 我试过对这一行进行各种修改

/ngrok-httphttp://localhost:5000 -主机头=本地主机：5000

我是Asp.Net核心的初学者。以下是我的应用程序的核心部分：

[Route("/")]
[ApiController]
public class UpdateController : ControllerBase
{
    [HttpPost]
    public async Task<OkResult> Post([FromBody]Update update)

Bot.cs

public static class Bot
{
    private static TelegramBotClient botClient;
    private static List<Command> commandsList;

    public static IReadOnlyList<Command> Commands => commandsList.AsReadOnly();

    public static async Task<TelegramBotClient> GetBotClientAsync()
    {
        if (botClient != null)
        {
            return botClient;
        }

        commandsList = new List<Command>
        {
            new StartCommand()
        };

        botClient = new TelegramBotClient(AppSettings.Token);
        await botClient.SetWebhookAsync(AppSettings.NGrokUrl);
        return botClient;
    }
}

---

你把你所有的创业课程都贴出来了吗？ 我没有看到任何ConfigureServices方法必须有services.AddMvc（）.addmvcopions（）行，也没有看到Configure方法中的app.UseMvc（）行

我不太确定，但我一直认为您需要这两条线来启用控制器

尝试以以下方式更改启动类：

public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddMvc().AddMvcOptions();
        services.AddControllersWithViews();
    }


    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }
        
        app.UseRouting();
        app.UseMvc();

        Bot.GetBotClientAsync().Wait();
    }
}

---

经过对@PiGi78答案的一些修改，它确实起了作用。以下是最终解决方案：

public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddMvc().AddMvcOptions(ApplyMvcOptions);
        services.AddControllersWithViews();
        services.AddControllers().AddNewtonsoftJson();
    }

    private void ApplyMvcOptions(MvcOptions options)
    {
        options.EnableEndpointRouting = false;
    }

    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }
        
        app.UseRouting();
        app.UseMvc();
        
        Bot.GetBotClientAsync().Wait();
    }
}

---

@非常感谢你

它确实有用！非常感谢。但是我不得不在代码中添加几行，因此我发布了一个新的答案。

dbug: Microsoft.AspNetCore.Hosting.Diagnostics[3]
      Hosting starting
dbug: Microsoft.AspNetCore.Server.Kestrel.Core.KestrelServer[2]
      Failed to locate the development https certificate at '(null)'.
dbug: Microsoft.AspNetCore.Hosting.Diagnostics[4]
      Hosting started
dbug: Microsoft.AspNetCore.Hosting.Diagnostics[0]
      Loaded hosting startup assembly eBot
Hosting environment: Development
Content root path: /Users/yuriibabii/Projects/eBot/eBot
Now listening on: http://localhost:5000
Application started. Press Ctrl+C to shut down.
dbug: Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets[6]
      Connection id "0HM4GMVPJLPSF" received FIN.
dbug: Microsoft.AspNetCore.Server.Kestrel[39]
      Connection id "0HM4GMVPJLPSF" accepted.
dbug: Microsoft.AspNetCore.Server.Kestrel[1]
      Connection id "0HM4GMVPJLPSF" started.
dbug: Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets[7]
      Connection id "0HM4GMVPJLPSF" sending FIN because: "The client closed the connection."
dbug: Microsoft.AspNetCore.Server.Kestrel[10]
      Connection id "0HM4GMVPJLPSF" disconnecting.
dbug: Microsoft.AspNetCore.Server.Kestrel[2]
      Connection id "0HM4GMVPJLPSF" stopped.
dbug: Microsoft.AspNetCore.Server.Kestrel[39]
      Connection id "0HM4GMVPJLPSG" accepted.
dbug: Microsoft.AspNetCore.Server.Kestrel[1]
      Connection id "0HM4GMVPJLPSG" started.
dbug: Microsoft.AspNetCore.Server.Kestrel[39]
      Connection id "0HM4GMVPJLPSH" accepted.
dbug: Microsoft.AspNetCore.Server.Kestrel[1]
      Connection id "0HM4GMVPJLPSH" started.
info: Microsoft.AspNetCore.Hosting.Diagnostics[1]
      Request starting HTTP/1.1 POST http://localhost:5000/ application/json 375
dbug: Microsoft.AspNetCore.HostFiltering.HostFilteringMiddleware[0]
      Wildcard detected, all requests with hosts will be allowed.
trce: Microsoft.AspNetCore.HostFiltering.HostFilteringMiddleware[2]
      All hosts are allowed.
dbug: Microsoft.AspNetCore.Server.Kestrel[9]
      Connection id "0HM4GMVPJLPSH" completed keep alive response.
info: Microsoft.AspNetCore.Hosting.Diagnostics[2]
      Request finished in 45.4537ms 404 
dbug: Microsoft.AspNetCore.Server.Kestrel[25]
      Connection id "0HM4GMVPJLPSH", Request id "0HM4GMVPJLPSH:00000001": started reading request body.
dbug: Microsoft.AspNetCore.Server.Kestrel[26]
      Connection id "0HM4GMVPJLPSH", Request id "0HM4GMVPJLPSH:00000001": done reading request body.
info: Microsoft.AspNetCore.Hosting.Diagnostics[1]
      Request starting HTTP/1.1 GET http://localhost:5000/  
trce: Microsoft.AspNetCore.HostFiltering.HostFilteringMiddleware[2]
      All hosts are allowed.
dbug: Microsoft.AspNetCore.Server.Kestrel[9]
      Connection id "0HM4GMVPJLPSG" completed keep alive response.
info: Microsoft.AspNetCore.Hosting.Diagnostics[2]
      Request finished in 9.3331ms 404 
info: Microsoft.AspNetCore.Hosting.Diagnostics[1]
      Request starting HTTP/1.1 POST http://localhost:5000/ application/json 375
trce: Microsoft.AspNetCore.HostFiltering.HostFilteringMiddleware[2]
      All hosts are allowed.
dbug: Microsoft.AspNetCore.Server.Kestrel[9]
      Connection id "0HM4GMVPJLPSH" completed keep alive response.
info: Microsoft.AspNetCore.Hosting.Diagnostics[2]
      Request finished in 10.7676ms 404 
dbug: Microsoft.AspNetCore.Server.Kestrel[25]
      Connection id "0HM4GMVPJLPSH", Request id "0HM4GMVPJLPSH:00000002": started reading request body.
dbug: Microsoft.AspNetCore.Server.Kestrel[26]
      Connection id "0HM4GMVPJLPSH", Request id "0HM4GMVPJLPSH:00000002": done reading request body.
info: Microsoft.AspNetCore.Hosting.Diagnostics[1]
      Request starting HTTP/1.1 POST http://localhost:5000/ application/json 375
trce: Microsoft.AspNetCore.HostFiltering.HostFilteringMiddleware[2]
      All hosts are allowed.
dbug: Microsoft.AspNetCore.Server.Kestrel[9]
      Connection id "0HM4GMVPJLPSH" completed keep alive response.
info: Microsoft.AspNetCore.Hosting.Diagnostics[2]
      Request finished in 8.5738ms 404 
dbug: Microsoft.AspNetCore.Server.Kestrel[25]
      Connection id "0HM4GMVPJLPSH", Request id "0HM4GMVPJLPSH:00000003": started reading request body.
dbug: Microsoft.AspNetCore.Server.Kestrel[26]
      Connection id "0HM4GMVPJLPSH", Request id "0HM4GMVPJLPSH:00000003": done reading request body.
info: Microsoft.AspNetCore.Hosting.Diagnostics[1]
      Request starting HTTP/1.1 POST http://localhost:5000/ application/json 375
trce: Microsoft.AspNetCore.HostFiltering.HostFilteringMiddleware[2]
      All hosts are allowed.
dbug: Microsoft.AspNetCore.Server.Kestrel[9]
      Connection id "0HM4GMVPJLPSH" completed keep alive response.
info: Microsoft.AspNetCore.Hosting.Diagnostics[2]
      Request finished in 8.8111ms 404 
dbug: Microsoft.AspNetCore.Server.Kestrel[25]
      Connection id "0HM4GMVPJLPSH", Request id "0HM4GMVPJLPSH:00000004": started reading request body.
dbug: Microsoft.AspNetCore.Server.Kestrel[26]
      Connection id "0HM4GMVPJLPSH", Request id "0HM4GMVPJLPSH:00000004": done reading request body.
info: Microsoft.AspNetCore.Hosting.Diagnostics[1]
      Request starting HTTP/1.1 POST http://localhost:5000/ application/json 375
trce: Microsoft.AspNetCore.HostFiltering.HostFilteringMiddleware[2]
      All hosts are allowed.
dbug: Microsoft.AspNetCore.Server.Kestrel[9]
      Connection id "0HM4GMVPJLPSH" completed keep alive response.
info: Microsoft.AspNetCore.Hosting.Diagnostics[2]
      Request finished in 9.6591ms 404 
dbug: Microsoft.AspNetCore.Server.Kestrel[25]
      Connection id "0HM4GMVPJLPSH", Request id "0HM4GMVPJLPSH:00000005": started reading request body.
dbug: Microsoft.AspNetCore.Server.Kestrel[26]
      Connection id "0HM4GMVPJLPSH", Request id "0HM4GMVPJLPSH:00000005": done reading request body.

public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddMvc().AddMvcOptions();
        services.AddControllersWithViews();
    }


    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }
        
        app.UseRouting();
        app.UseMvc();

        Bot.GetBotClientAsync().Wait();
    }
}

public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddMvc().AddMvcOptions(ApplyMvcOptions);
        services.AddControllersWithViews();
        services.AddControllers().AddNewtonsoftJson();
    }

    private void ApplyMvcOptions(MvcOptions options)
    {
        options.EnableEndpointRouting = false;
    }

    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }
        
        app.UseRouting();
        app.UseMvc();
        
        Bot.GetBotClientAsync().Wait();
    }
}