POLLY Archives - icodebroker

[C#/ASP.NET MVC/.NETCORE] PollyServiceCollectionExtensions 클래스 : AddPolicyRegistry 확장 메소드를 사용해 Polly 레지스트리에 정책 추가하기

■ PollyServiceCollectionExtensions 클래스의 AddPolicyRegistry 확장 메소드를 사용해 Polly 레지스트리에 정책을 추가하는 방법을 보여준다. ▶ Startup.cs


using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using System;
using System.Net.Http;

using Polly;
using Polly.Timeout;
using Polly.Registry;

namespace TestProject
{
    /// <summary>
    /// 시작
    /// </summary>
    public class Startup
    {
        //////////////////////////////////////////////////////////////////////////////////////////////////// Property
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 구성 - Configuration

        /// <summary>
        /// 구성
        /// </summary>
        public IConfiguration Configuration { get; }

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 생성자 - Startup(configuration)

        /// <summary>
        /// 생성자
        /// </summary>
        /// <param name="configuration">구성</param>
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Method
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 서비스 컬렉션 구성하기 - ConfigureServices(services)

        /// <summary>
        /// 서비스 컬렉션 구성하기
        /// </summary>
        /// <param name="services">서비스 컬렉션</param>
        public void ConfigureServices(IServiceCollection services)
        {
            AsyncTimeoutPolicy<HttpResponseMessage> regularTimeoutPolicy = Policy.TimeoutAsync<HttpResponseMessage>
            (
                TimeSpan.FromSeconds(10)
            );

            AsyncTimeoutPolicy<HttpResponseMessage> longTimeoutPolicy = Policy.TimeoutAsync<HttpResponseMessage>
            (
                TimeSpan.FromSeconds(30)
            );

            IPolicyRegistry<string> policyRegistry = services.AddPolicyRegistry();

            policyRegistry.Add("regular", regularTimeoutPolicy);
            policyRegistry.Add("long"   , longTimeoutPolicy   );

            services.AddHttpClient("regularClient")
                .AddPolicyHandlerFromRegistry("regular");

            services.AddHttpClient("longClient")
               .AddPolicyHandlerFromRegistry("long");

            services.AddControllers();

            services.AddRazorPages();
        }

        #endregion
        #region 구성하기 - Configure(app, environment)

        /// <summary>
        /// 구성하기
        /// </summary>
        /// <param name="app">애플리케이션 빌더</param>
        /// <param name="environment">웹 호스트 환경</param>
        public void Configure(IApplicationBuilder app, IWebHostEnvironment environment)
        {
            if(environment.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseExceptionHandler("/Error");
            }

            app.UseRouting();

            app.UseEndpoints
            (
                endpoints =>
                {
                    endpoints.MapControllerRoute
                    (
                        name    : "default",
                        pattern : "{controller=Home}/{action=Index}/{id?}"
                    );

                    endpoints.MapRazorPages();
                }
            );
        }

        #endregion
    }
}

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using Microsoft.AspNetCore.Builder;

using Microsoft.AspNetCore.Hosting;

using Microsoft.Extensions.Configuration;

using Microsoft.Extensions.DependencyInjection;

using Microsoft.Extensions.Hosting;

using System;

using System.Net.Http;

using Polly;

using Polly.Timeout;

using Polly.Registry;

namespace TestProject

{

/// <summary>

/// 시작

/// </summary>

public class Startup

{

//////////////////////////////////////////////////////////////////////////////////////////////////// Property

////////////////////////////////////////////////////////////////////////////////////////// Public

#region 구성 - Configuration

/// <summary>

/// 구성

/// </summary>

public IConfiguration Configuration { get; }

#endregion

//////////////////////////////////////////////////////////////////////////////////////////////////// Constructor

////////////////////////////////////////////////////////////////////////////////////////// Public

#region 생성자 - Startup(configuration)

/// <summary>

/// 생성자

/// </summary>

/// <param name="configuration">구성</param>

public Startup(IConfiguration configuration)

{

Configuration = configuration;

}

#endregion

//////////////////////////////////////////////////////////////////////////////////////////////////// Method

////////////////////////////////////////////////////////////////////////////////////////// Public

#region 서비스 컬렉션 구성하기 - ConfigureServices(services)

/// <summary>

/// 서비스 컬렉션 구성하기

/// </summary>

/// <param name="services">서비스 컬렉션</param>

public void ConfigureServices(IServiceCollection services)

{

AsyncTimeoutPolicy<HttpResponseMessage> regularTimeoutPolicy = Policy.TimeoutAsync<HttpResponseMessage>

(

TimeSpan.FromSeconds(10)

);

AsyncTimeoutPolicy<HttpResponseMessage> longTimeoutPolicy = Policy.TimeoutAsync<HttpResponseMessage>

(

TimeSpan.FromSeconds(30)

);

IPolicyRegistry<string> policyRegistry = services.AddPolicyRegistry();

policyRegistry.Add("regular", regularTimeoutPolicy);

policyRegistry.Add("long" , longTimeoutPolicy );

services.AddHttpClient("regularClient")

.AddPolicyHandlerFromRegistry("regular");

services.AddHttpClient("longClient")

.AddPolicyHandlerFromRegistry("long");

services.AddControllers();

services.AddRazorPages();

}

#endregion

#region 구성하기 - Configure(app, environment)

/// <summary>

/// 구성하기

/// </summary>

/// <param name="app">애플리케이션 빌더</param>

/// <param name="environment">웹 호스트 환경</param>

public void Configure(IApplicationBuilder app, IWebHostEnvironment environment)

{

if(environment.IsDevelopment())

{

app.UseDeveloperExceptionPage();

}

else

{

app.UseExceptionHandler("/Error");

}

app.UseRouting();

app.UseEndpoints

(

endpoints =>

{

endpoints.MapControllerRoute

(

name : "default",

pattern : "{controller=Home}/{action=Index}/{id?}"

);

endpoints.MapRazorPages();

}

);

}

#endregion

}

※ 설치 패키지 : Microsoft.Extensions.Http.Polly

[C#/ASP.NET MVC/.NETCORE] PollyHttpClientBuilderExtensions 클래스 : AddTransientHttpErrorPolicy 확장 메소드를 사용해 Polly 정책 중첩하기

■ PollyHttpClientBuilderExtensions 클래스의 AddTransientHttpErrorPolicy 확장 메소드를 사용해 Polly 정책을 중첩하는 방법을 보여준다. ▶ Startup.cs


using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using System;

using Polly;

namespace TestProject
{
    /// <summary>
    /// 시작
    /// </summary>
    public class Startup
    {
        //////////////////////////////////////////////////////////////////////////////////////////////////// Property
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 구성 - Configuration

        /// <summary>
        /// 구성
        /// </summary>
        public IConfiguration Configuration { get; }

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 생성자 - Startup(configuration)

        /// <summary>
        /// 생성자
        /// </summary>
        /// <param name="configuration">구성</param>
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Method
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 서비스 컬렉션 구성하기 - ConfigureServices(services)

        /// <summary>
        /// 서비스 컬렉션 구성하기
        /// </summary>
        /// <param name="services">서비스 컬렉션</param>
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddHttpClient("test")
                // 첫번째 처리기는 재시도 정책을 추가하기 위해 AddTransientHttpErrorPolicy를 사용한다.
                // 실패한 요청은 최대 3번까지 다시 시도된다.
                .AddTransientHttpErrorPolicy(policyBuilder => policyBuilder.RetryAsync(3))
                // 두번째 호출 AddTransientHttpErrorPolicy는 회로 차단기 정책을 추가한다.
                // 5번의 시도가 순차적으로 실패하는 경우 추가적인 외부 요청은 30초 동안 차단된다.
                // 회로 차단기 정책은 상태를 저장한다.
                // 이 클라이언트를 통한 모든 호출은 동일한 회로 상태를 공유한다.
                .AddTransientHttpErrorPolicy(policyBuilder => policyBuilder.CircuitBreakerAsync(5, TimeSpan.FromSeconds(30)));

            services.AddControllers();

            services.AddRazorPages();
        }

        #endregion
        #region 구성하기 - Configure(app, environment)

        /// <summary>
        /// 구성하기
        /// </summary>
        /// <param name="app">애플리케이션 빌더</param>
        /// <param name="environment">웹 호스트 환경</param>
        public void Configure(IApplicationBuilder app, IWebHostEnvironment environment)
        {
            if(environment.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseExceptionHandler("/Error");
            }

            app.UseRouting();

            app.UseEndpoints
            (
                endpoints =>
                {
                    endpoints.MapControllerRoute
                    (
                        name    : "default",
                        pattern : "{controller=Home}/{action=Index}/{id?}"
                    );

                    endpoints.MapRazorPages();
                }
            );
        }

        #endregion
    }
}

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using Microsoft.AspNetCore.Builder;

using Microsoft.AspNetCore.Hosting;

using Microsoft.Extensions.Configuration;

using Microsoft.Extensions.DependencyInjection;

using Microsoft.Extensions.Hosting;

using System;

using Polly;

namespace TestProject

{

/// <summary>

/// 시작

/// </summary>

public class Startup

{

//////////////////////////////////////////////////////////////////////////////////////////////////// Property

////////////////////////////////////////////////////////////////////////////////////////// Public

#region 구성 - Configuration

/// <summary>

/// 구성

/// </summary>

public IConfiguration Configuration { get; }

#endregion

//////////////////////////////////////////////////////////////////////////////////////////////////// Constructor

////////////////////////////////////////////////////////////////////////////////////////// Public

#region 생성자 - Startup(configuration)

/// <summary>

/// 생성자

/// </summary>

/// <param name="configuration">구성</param>

public Startup(IConfiguration configuration)

{

Configuration = configuration;

}

#endregion

//////////////////////////////////////////////////////////////////////////////////////////////////// Method

////////////////////////////////////////////////////////////////////////////////////////// Public

#region 서비스 컬렉션 구성하기 - ConfigureServices(services)

/// <summary>

/// 서비스 컬렉션 구성하기

/// </summary>

/// <param name="services">서비스 컬렉션</param>

public void ConfigureServices(IServiceCollection services)

{

services.AddHttpClient("test")

// 첫번째 처리기는 재시도 정책을 추가하기 위해 AddTransientHttpErrorPolicy를 사용한다.

// 실패한 요청은 최대 3번까지 다시 시도된다.

.AddTransientHttpErrorPolicy(policyBuilder => policyBuilder.RetryAsync(3))

// 두번째 호출 AddTransientHttpErrorPolicy는 회로 차단기 정책을 추가한다.

// 5번의 시도가 순차적으로 실패하는 경우 추가적인 외부 요청은 30초 동안 차단된다.

// 회로 차단기 정책은 상태를 저장한다.

// 이 클라이언트를 통한 모든 호출은 동일한 회로 상태를 공유한다.

.AddTransientHttpErrorPolicy(policyBuilder => policyBuilder.CircuitBreakerAsync(5, TimeSpan.FromSeconds(30)));

services.AddControllers();

services.AddRazorPages();

}

#endregion

#region 구성하기 - Configure(app, environment)

/// <summary>

/// 구성하기

/// </summary>

/// <param name="app">애플리케이션 빌더</param>

/// <param name="environment">웹 호스트 환경</param>

public void Configure(IApplicationBuilder app, IWebHostEnvironment environment)

{

if(environment.IsDevelopment())

{

app.UseDeveloperExceptionPage();

}

else

{

app.UseExceptionHandler("/Error");

}

app.UseRouting();

app.UseEndpoints

(

endpoints =>

{

endpoints.MapControllerRoute

(

name : "default",

pattern : "{controller=Home}/{action=Index}/{id?}"

);

endpoints.MapRazorPages();

}

);

}

#endregion

}

※ 설치 패키지 : Microsoft.Extensions.Http.Polly

[C#/ASP.NET MVC/.NETCORE] PollyHttpClientBuilderExtensions 클래스 : AddPolicyHandler 확장 메소드를 사용해 동적으로 정책 선택하기

■ PollyHttpClientBuilderExtensions 클래스의 AddPolicyHandler 확장 메소드를 사용해 동적으로 정책을 선택하는 방법을 보여준다. ▶ Startup.cs


using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using System;
using System.Net.Http;

using Polly;
using Polly.Timeout;

namespace TestProject
{
    /// <summary>
    /// 시작
    /// </summary>
    public class Startup
    {
        //////////////////////////////////////////////////////////////////////////////////////////////////// Property
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 구성 - Configuration

        /// <summary>
        /// 구성
        /// </summary>
        public IConfiguration Configuration { get; }

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 생성자 - Startup(configuration)

        /// <summary>
        /// 생성자
        /// </summary>
        /// <param name="configuration">구성</param>
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Method
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 서비스 컬렉션 구성하기 - ConfigureServices(services)

        /// <summary>
        /// 서비스 컬렉션 구성하기
        /// </summary>
        /// <param name="services">서비스 컬렉션</param>
        public void ConfigureServices(IServiceCollection services)
        {
            AsyncTimeoutPolicy<HttpResponseMessage> regularTimeoutPolicy = Policy.TimeoutAsync<HttpResponseMessage>
            (
                TimeSpan.FromSeconds(10)
            );

            AsyncTimeoutPolicy<HttpResponseMessage> longTimeoutPolicy = Policy.TimeoutAsync<HttpResponseMessage>
            (
                TimeSpan.FromSeconds(30)
            );

            services.AddHttpClient("test")
                .AddPolicyHandler
                (
                    request => request.Method == HttpMethod.Get ? regularTimeoutPolicy : longTimeoutPolicy
                );

            services.AddControllers();

            services.AddRazorPages();
        }

        #endregion
        #region 구성하기 - Configure(app, environment)

        /// <summary>
        /// 구성하기
        /// </summary>
        /// <param name="app">애플리케이션 빌더</param>
        /// <param name="environment">웹 호스트 환경</param>
        public void Configure(IApplicationBuilder app, IWebHostEnvironment environment)
        {
            if(environment.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseExceptionHandler("/Error");
            }

            app.UseRouting();

            app.UseEndpoints
            (
                endpoints =>
                {
                    endpoints.MapControllerRoute
                    (
                        name    : "default",
                        pattern : "{controller=Home}/{action=Index}/{id?}"
                    );

                    endpoints.MapRazorPages();
                }
            );
        }

        #endregion
    }
}

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using Microsoft.AspNetCore.Builder;

using Microsoft.AspNetCore.Hosting;

using Microsoft.Extensions.Configuration;

using Microsoft.Extensions.DependencyInjection;

using Microsoft.Extensions.Hosting;

using System;

using System.Net.Http;

using Polly;

using Polly.Timeout;

namespace TestProject

{

/// <summary>

/// 시작

/// </summary>

public class Startup

{

//////////////////////////////////////////////////////////////////////////////////////////////////// Property

////////////////////////////////////////////////////////////////////////////////////////// Public

#region 구성 - Configuration

/// <summary>

/// 구성

/// </summary>

public IConfiguration Configuration { get; }

#endregion

//////////////////////////////////////////////////////////////////////////////////////////////////// Constructor

////////////////////////////////////////////////////////////////////////////////////////// Public

#region 생성자 - Startup(configuration)

/// <summary>

/// 생성자

/// </summary>

/// <param name="configuration">구성</param>

public Startup(IConfiguration configuration)

{

Configuration = configuration;

}

#endregion

//////////////////////////////////////////////////////////////////////////////////////////////////// Method

////////////////////////////////////////////////////////////////////////////////////////// Public

#region 서비스 컬렉션 구성하기 - ConfigureServices(services)

/// <summary>

/// 서비스 컬렉션 구성하기

/// </summary>

/// <param name="services">서비스 컬렉션</param>

public void ConfigureServices(IServiceCollection services)

{

AsyncTimeoutPolicy<HttpResponseMessage> regularTimeoutPolicy = Policy.TimeoutAsync<HttpResponseMessage>

(

TimeSpan.FromSeconds(10)

);

AsyncTimeoutPolicy<HttpResponseMessage> longTimeoutPolicy = Policy.TimeoutAsync<HttpResponseMessage>

(

TimeSpan.FromSeconds(30)

);

services.AddHttpClient("test")

.AddPolicyHandler

(

request => request.Method == HttpMethod.Get ? regularTimeoutPolicy : longTimeoutPolicy

);

services.AddControllers();

services.AddRazorPages();

}

#endregion

#region 구성하기 - Configure(app, environment)

/// <summary>

/// 구성하기

/// </summary>

/// <param name="app">애플리케이션 빌더</param>

/// <param name="environment">웹 호스트 환경</param>

public void Configure(IApplicationBuilder app, IWebHostEnvironment environment)

{

if(environment.IsDevelopment())

{

app.UseDeveloperExceptionPage();

}

else

{

app.UseExceptionHandler("/Error");

}

app.UseRouting();

app.UseEndpoints

(

endpoints =>

{

endpoints.MapControllerRoute

(

name : "default",

pattern : "{controller=Home}/{action=Index}/{id?}"

);

endpoints.MapRazorPages();

}

);

}

#endregion

}

※ 설치 패키지 : Microsoft.Extensions.Http.Polly

[C#/ASP.NET MVC/.NETCORE] PollyHttpClientBuilderExtensions 클래스 : AddTransientHttpErrorPolicy 확장 메소드를 사용해 일시적인 오류 처리하기

■ PollyHttpClientBuilderExtensions 클래스의 AddTransientHttpErrorPolicy 확장 메소드를 사용해 일시적인 오류를 처리하는 방법을 보여준다. ▶ UnreliableEndpointCallerService.cs


using System.Net.Http;
using System.Threading.Tasks;

namespace TestProject
{
    /// <summary>
    /// 신뢰할 수 없는 엔드포인트 호출자 서비스
    /// </summary>
    public class UnreliableEndpointCallerService
    {
        //////////////////////////////////////////////////////////////////////////////////////////////////// Property
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region HTTP 클라이언트 - Client

        /// <summary>
        /// HTTP 클라이언트
        /// </summary>
        public HttpClient Client { get; }

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 생성자 - UnreliableEndpointCallerService(client)

        /// <summary>
        /// 생성자
        /// </summary>
        /// <param name="client">HTTP 클라이언트</param>
        public UnreliableEndpointCallerService(HttpClient client)
        {
            // ConfigureServices에서 이 유형이 지정된 클라이언트에 대한 등록을 기반으로
            // 이 클라이언트는 Polly WaitAndRetry 핸들러를 사용한다.
            Client = client;
        }

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Method
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 데이터 구하기 (비동기) - GetDataAsync(requestURL)

        /// <summary>
        /// 데이터 구하기 (비동기)
        /// </summary>
        /// <param name="requestURL">요청 URL</param>
        /// <returns>문자열 태스크</returns>
        public async Task<string> GetDataAsync(string requestURL)
        {
            HttpResponseMessage httpResponseMessage = await Client.GetAsync(requestURL);

            return httpResponseMessage.IsSuccessStatusCode ? "Succeeded" : "Failed";
        }

        #endregion
    }
}

using System.Net.Http;

using System.Threading.Tasks;

namespace TestProject

{

/// <summary>

/// 신뢰할 수 없는 엔드포인트 호출자 서비스

/// </summary>

public class UnreliableEndpointCallerService

{

//////////////////////////////////////////////////////////////////////////////////////////////////// Property

////////////////////////////////////////////////////////////////////////////////////////// Public

#region HTTP 클라이언트 - Client

/// <summary>

/// HTTP 클라이언트

/// </summary>

public HttpClient Client { get; }

#endregion

//////////////////////////////////////////////////////////////////////////////////////////////////// Constructor

////////////////////////////////////////////////////////////////////////////////////////// Public

#region 생성자 - UnreliableEndpointCallerService(client)

/// <summary>

/// 생성자

/// </summary>

/// <param name="client">HTTP 클라이언트</param>

public UnreliableEndpointCallerService(HttpClient client)

{

// ConfigureServices에서 이 유형이 지정된 클라이언트에 대한 등록을 기반으로

// 이 클라이언트는 Polly WaitAndRetry 핸들러를 사용한다.

Client = client;

}

#endregion

//////////////////////////////////////////////////////////////////////////////////////////////////// Method

////////////////////////////////////////////////////////////////////////////////////////// Public

#region 데이터 구하기 (비동기) - GetDataAsync(requestURL)

/// <summary>

/// 데이터 구하기 (비동기)

/// </summary>

/// <param name="requestURL">요청 URL</param>

/// <returns>문자열 태스크</returns>

public async Task<string> GetDataAsync(string requestURL)

{

HttpResponseMessage httpResponseMessage = await Client.GetAsync(requestURL);

return httpResponseMessage.IsSuccessStatusCode ? "Succeeded" : "Failed";

}

#endregion

}

▶ Startup.cs


using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using System;

using Polly;

namespace TestProject
{
    /// <summary>
    /// 시작
    /// </summary>
    public class Startup
    {
        //////////////////////////////////////////////////////////////////////////////////////////////////// Property
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 구성 - Configuration

        /// <summary>
        /// 구성
        /// </summary>
        public IConfiguration Configuration { get; }

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 생성자 - Startup(configuration)

        /// <summary>
        /// 생성자
        /// </summary>
        /// <param name="configuration">구성</param>
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Method
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 서비스 컬렉션 구성하기 - ConfigureServices(services)

        /// <summary>
        /// 서비스 컬렉션 구성하기
        /// </summary>
        /// <param name="services">서비스 컬렉션</param>
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddHttpClient<UnreliableEndpointCallerService>()
                .AddTransientHttpErrorPolicy
                (
                    // 실패한 요청은 최대 3번까지 다시 시도되며 시도 간 600밀리초의 지연 간격을 둔다.
                    policyBuilder => policyBuilder.WaitAndRetryAsync(3, _ => TimeSpan.FromMilliseconds(600))
                );

            services.AddControllers();

            services.AddRazorPages();
        }

        #endregion
        #region 구성하기 - Configure(app, environment)

        /// <summary>
        /// 구성하기
        /// </summary>
        /// <param name="app">애플리케이션 빌더</param>
        /// <param name="environment">웹 호스트 환경</param>
        public void Configure(IApplicationBuilder app, IWebHostEnvironment environment)
        {
            if(environment.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseExceptionHandler("/Error");
            }

            app.UseRouting();

            app.UseEndpoints
            (
                endpoints =>
                {
                    endpoints.MapControllerRoute
                    (
                        name    : "default",
                        pattern : "{controller=Home}/{action=Index}/{id?}"
                    );

                    endpoints.MapRazorPages();
                }
            );
        }

        #endregion
    }
}

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using Microsoft.AspNetCore.Builder;

using Microsoft.AspNetCore.Hosting;

using Microsoft.Extensions.Configuration;

using Microsoft.Extensions.DependencyInjection;

using Microsoft.Extensions.Hosting;

using System;

using Polly;

namespace TestProject

{

/// <summary>

/// 시작

/// </summary>

public class Startup

{

//////////////////////////////////////////////////////////////////////////////////////////////////// Property

////////////////////////////////////////////////////////////////////////////////////////// Public

#region 구성 - Configuration

/// <summary>

/// 구성

/// </summary>

public IConfiguration Configuration { get; }

#endregion

//////////////////////////////////////////////////////////////////////////////////////////////////// Constructor

////////////////////////////////////////////////////////////////////////////////////////// Public

#region 생성자 - Startup(configuration)

/// <summary>

/// 생성자

/// </summary>

/// <param name="configuration">구성</param>

public Startup(IConfiguration configuration)

{

Configuration = configuration;

}

#endregion

//////////////////////////////////////////////////////////////////////////////////////////////////// Method

////////////////////////////////////////////////////////////////////////////////////////// Public

#region 서비스 컬렉션 구성하기 - ConfigureServices(services)

/// <summary>

/// 서비스 컬렉션 구성하기

/// </summary>

/// <param name="services">서비스 컬렉션</param>

public void ConfigureServices(IServiceCollection services)

{

services.AddHttpClient<UnreliableEndpointCallerService>()

.AddTransientHttpErrorPolicy

(

// 실패한 요청은 최대 3번까지 다시 시도되며 시도 간 600밀리초의 지연 간격을 둔다.

policyBuilder => policyBuilder.WaitAndRetryAsync(3, _ => TimeSpan.FromMilliseconds(600))

);

services.AddControllers();

services.AddRazorPages();

}

#endregion

#region 구성하기 - Configure(app, environment)

/// <summary>

/// 구성하기

/// </summary>

/// <param name="app">애플리케이션 빌더</param>

/// <param name="environment">웹 호스트 환경</param>

public void Configure(IApplicationBuilder app, IWebHostEnvironment environment)

{

if(environment.IsDevelopment())

{

app.UseDeveloperExceptionPage();

}

else

{

app.UseExceptionHandler("/Error");

}

app.UseRouting();

app.UseEndpoints

(

endpoints =>

{

endpoints.MapControllerRoute

(

name : "default",

pattern : "{controller=Home}/{action=Index}/{id?}"

);

endpoints.MapRazorPages();

}

);

}

#endregion

}

※ 설치 패키지 :

[C#/COMMON/.NETCORE] Microsoft.Extensions.Http.Polly 누겟 설치하기

■ Microsoft.Extensions.Http.Polly 누겟을 설치하는 방법을 보여준다. 1. Visual Studio를 실행한다. 2. [도구] / [NuGet 패키지 관리자] / [패키지 관리자 콘솔] 메뉴를 실행한다.