There are two APIs on two different ports. I want to call these with an address (IP:port ). I used ocelot api gateway for this purpose. But when running the program, the following error is returned

System.InvalidOperationException: 'Unable to find the required services. Please add all the required services by calling 'IServiceCollection.AddAuthorization' inside the call to 'ConfigureServices(...)' in the application startup code.'

Startup.cs:

    public void ConfigureServices(IServiceCollection services)
    {

    }

    public async void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }
        else
        {
            app.UseExceptionHandler("/Error");
        }

        app.UseStaticFiles();

        app.UseRouting();

        app.UseAuthorization();

        app.UseEndpoints(endpoints =>
        {
            endpoints.MapControllers();
        });           
    }

ocelot.json

{
  "Routes": [
  {
  "DownstreamPathTemplate": "/api/User",
  "DownstreamScheme": "http",
  "FileCacheOptions": {
      "TtlSeconds": 15,
      "Region": "somename"
  },
  "DownstreamHostAndPorts": [
    {
      "Host": "127.0.0.1",
      "Port": 8072
    }
  ],
  "UpstreamPathTemplate": "/user",
  "UpstreamHttpMethod": [ "GET", "POST" ]
},
{
  "DownstreamPathTemplate": "/api/user/{id}",
  "DownstreamScheme": "http",
  "DownstreamHostAndPorts": [
    {
      "Host": "127.0.0.1",
      "Port": 8071
    }
  ],
  "UpstreamPathTemplate": "/user/{id}",
  "UpstreamHttpMethod": [ "GET" ]
}
] 
}

CodePudding user response：

In your Configure method you need to tell your application to register and use ocelot. It is clear from your json file that you have used FileCacheOptions. So

edit the Startup.cs:

public void ConfigureServices(IServiceCollection services)
{
   services.AddOcelot()
  .AddCacheManager(x =>
   {
      x.WithDictionaryHandle();
   });
}

public async void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
    if (env.IsDevelopment())
    {
        app.UseDeveloperExceptionPage();
    }
    else
    {
        app.UseExceptionHandler("/Error");
    }

    app.UseStaticFiles();

    app.UseRouting();

    app.UseAuthorization();

    app.UseEndpoints(endpoints =>
    {
        endpoints.MapControllers();
    });   
   await app.UseOcelot(); 
}

You should also declare the address of the ocelot.json in the Program.cs file:

    public static IHostBuilder CreateHostBuilder(string[] args) =>
        Host.CreateDefaultBuilder(args)
        .ConfigureWebHostDefaults(webBuilder =>
         {
                webBuilder.UseStartup<Startup>();
         }).ConfigureAppConfiguration((hostingContext, config) =>
            {
                config.AddJsonFile("ocelot.json"); //The exact path of the ocelot.json
            });

for more information see this link ocelot configuration