更新

HttpClientStudy.Core/HttpError.cs

@@ -20,8 +20,12 @@ namespace HttpClientStudy.Core
     ///         <description>(适用外部)</description>
     ///      </item>
     ///      <item>
+    ///         <term>HttpClient 管道</term>
+    ///         <description>(统一处理)</description>
+    ///      </item>
+    ///      <item>
     ///         <term>使用 Polly 类库</term>
-    ///             <description>(更多功能)</description>
+    ///         <description>(更多功能,也可结合HttpClient管道)</description>
     ///      </item>
     /// </list>
     /// </summary>
@@ -47,6 +51,27 @@ namespace HttpClientStudy.Core
             return response.StatusCode;
         }
 
+        /// <summary>
+        /// 没有服务(WebApi服务未启动)
+        /// </summary>
+        /// <returns></returns>
+        public async Task<HttpStatusCode> NoServiceAsync()
+        {
+            try 
+            {
+                var response = await HttpClient.GetAsync("http://localhost:30");
+            }
+            
+            catch (Exception ex)
+            {
+                // 捕获异常,处理
+                await Console.Out.WriteLineAsync(ex.Message );
+                throw;
+            }
+           
+            return HttpStatusCode.OK;
+        }
+
         /// <summary>
         /// 404错误
         /// </summary>

HttpClientStudy.UnitTest/HttpErrorTest.cs

@@ -24,6 +24,14 @@ namespace HttpClientStudy.UnitTest
             await Assert.ThrowsAsync<HttpRequestException>(func);
         }
 
+        [Fact]
+        public async Task NoService_Test()
+        {
+            Func<Task> func = _httpError.NoServiceAsync;
+
+            await Assert.ThrowsAsync<HttpRequestException>(func);
+        }
+
         [Fact]
         public async Task Http404_Test()
         {