为什么 Asp.Net Core Kestrel 服务器向 Ngrok 返回 404 并且控制器永远不会被调用？

Question

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 Telegram bot 设置 webhook。 它在 Mac 上运行，带有 Kestrel 服务器和 Ngrok，用于将 https 代理到 webhook。 目前它返回 404 给 Ngrok，我也在控制台中看到 404。 任何帮助表示赞赏。 我已经尝试了这一行的各种修改./ngrok http http://localhost:5000 -host-header=localhost:5000

我是 Asp.Net Core 的初学者。 这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)

这个永远不会被调用。 这是我的 Program.cs

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

    private static IWebHost BuildWebHost(string[] args) =>
        WebHost.CreateDefaultBuilder(args)
            .UseKestrel()
            .UseContentRoot(Directory.GetCurrentDirectory())
            .UseStartup<Startup>()
            .Build();
}

启动文件

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

机器人

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;
    }
}

设置 webhook 工作正常，Ngrok 收到请求，但来自 Kestrel 的答案始终是 404，并且永远不会调用 Post 方法。

控制台输出示例：

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.

Answer 1

你发布了所有的 Startup 课程吗？ 我没有看到任何 ConfigureServices 方法，您必须在 ConfigureServices 方法中使用 services.AddMvc().AddMvcOptions() 行，也没有看到 app.UseMvc() 行。

我不太确定，但我一直认为您需要这两行来启用控制器。

尝试以这种方式更改您的 Startup 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();
    }
}

Answer 2

通过对@PiGi78 的回答进行一些修改，它确实有效。 这是最终的解决方案：

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();
    }
}

@PiGi78 非常感谢！