更新

HttpClientStudy.WebApp/Controllers/AdvancedGetController.cs

@@ -28,14 +28,19 @@ namespace HttpClientStudy.WebApp.Controllers
         /// </summary>
         /// <returns></returns>
         [HttpGet]
+        [HttpPost]
         public async Task<IActionResult> GetWithBodyAsync()
         {
-            using (var reader = new StreamReader(Request.Body, Encoding.UTF8, detectEncodingFromByteOrderMarks: false, bufferSize: 1024, leaveOpen: true))
+            if (Request.ContentLength>0)
             {
-                var body = await reader.ReadToEndAsync();
-                // 现在你有了请求体，可以按照你的需求处理它
+                using (var reader = new StreamReader(Request.Body, Encoding.UTF8, detectEncodingFromByteOrderMarks: false, bufferSize: 1024, leaveOpen: true))
+                {
+                    var body = await reader.ReadToEndAsync();
+                    // 现在你有了请求体，可以按照你的需求处理它
+                }
             }
 
+
             var reslut = BaseResultUtil.Success("操作成功");
             return Ok(reslut);
         }

HttpClientStudy.WebApp/Program.cs

@@ -40,8 +40,9 @@ namespace HttpClientStudy.WebApp
             //配置Kestrel服务器选项
             builder.Services.Configure<KestrelServerOptions>( option => 
             {
-                //允许同步 IO 操作(允许get方法有请求body)
+                //(允许get方法有请求body)
                 //ASP.NET Core 3.0 之前的版本，AllowSynchronousIO 默认是开启的
+                //设置 true ：允许同步 IO 操作,这样允许接收Get请求中的请求体数据.但只能直接从流中读取，不能自动模型绑定。
                 option.AllowSynchronousIO = true;
             });