C# -- HttpClient 기본 사용법 ; http, https

C# -- HttpClient 기본 사용법

** https, http 모두 상관없이 사용가능함.

** Main() 함수에서는 await 를 사용못함

   --> 따라서, Main() 함수내에서, 비동기함수를 동기적으로 실행시키기위해서는 .GetAwaiter().GetResult() 를 사용해야함.

using System;

using System.Net;

using System.Net.Http;

using System.Net.Http.Headers;

using System.Threading.Tasks;

namespace HttpClient_test

{

    class Program

    {

        static readonly HttpClient httpClient = new HttpClient();

        //static HttpRequestHeaders requestHeaders = httpClient.DefaultRequestHeaders;

        static void Main(string[] args)

        {

            string httpsUrl = "https://jsonplaceholder.typicode.com/todos/1"; 

            string httpUrl = "http://jsonplaceholder.typicode.com/todos/2";

            Console.WriteLine($" -------- HTTPS ------------");

            Test(httpsUrl).GetAwaiter().GetResult();  // Main함수에서 await Test(httpsUrl) 사용못하므로, 이를 대신함

            Console.WriteLine($"\n\n\n --------- HTTP ------------");

            Test(httpUrl).GetAwaiter().GetResult();

            Console.WriteLine($" ---------- END ------------");

            Console.Read();

        }

        static async Task Test(string url)

        {

            try

            {

                using (var response = await httpClient.GetAsync(url))

                {

                    Console.WriteLine(response.StatusCode);

                    if (HttpStatusCode.OK == response.StatusCode)

                    {

                        string body = await response.Content.ReadAsStringAsync();

                        Console.WriteLine(body);

                    }

                    else

                    {

                        Console.WriteLine($" -- response.ReasonPhrase ==> {response.ReasonPhrase}");

                    }

                }

            }

            catch (HttpRequestException ex)

            {

                Console.WriteLine($"ex.Message={ex.Message}");

                Console.WriteLine($"ex.InnerException.Message = {ex.InnerException.Message}");

                Console.WriteLine($"----------- 서버에 연결할수없습니다 ---------------------");

            }

            catch (Exception ex2)

            {

                Console.WriteLine($"Exception={ex2.Message}");

            }

        }

    }

}

** 실행결과