PostAsync返回异常

时间：2020-08-06 18:03:01

标签： c# console-application dotnet-httpclient

我正在使用控制台应用程序进行容量测试，在这些测试中，我将调用在API内创建的JobTitles路由，在这种情况下，就是处理该路由的控制器。

对于我正在使用的Post函数，我使用了HttpClient PostAsJsonAsync()方法。因为我已经在其他代码中使用了此函数，所以我没有很多问题，但是现在它返回异常System.Net.Http.HttpRequestException: An error occurred while sending the request.

我没有使用任何.Result调用，因为它可能最终导致死锁；我也尝试使用.ConfigureAwait (false)，但没有用。我也尝试使用Easy.Common RestClient()，但是发生相同的错误，我可能会遇到各种错误。很抱歉，但是仅通过查看堆栈跟踪就无法弄清错误是什么，我仍然没学会如何找出错误。

我把代码放在这里以便更好地查看，因为它有点大：

https://repl.it/repls/JubilantMoccasinArrays

我试图创建一个通用方法，因为在其他代码中我为每个实体制作了一个帖子，利用这个问题，我想知道除RestClient和HttpClient之外是否还有另一个我可以用来发送多个消息的方法调用，而不会由于许多API条目而导致取消发货，因为它会自动取消以避免DDoS。

还有我从RestClient获得的堆栈跟踪：

Unhandled exception. System.Net.Http.HttpRequestException: An error occurred while sending the request.
 ---> System.IO.IOException: The response ended prematurely.
   at System.Net.Http.HttpConnection.FillAsync()
   at System.Net.Http.HttpConnection.ReadNextResponseHeaderLineAsync(Boolean foldedHeadersAllowed)
   at System.Net.Http.HttpConnection.SendAsyncCore(HttpRequestMessage request, CancellationToken cancellationToken)
   --- End of inner exception stack trace ---
   at System.Net.Http.HttpConnection.SendAsyncCore(HttpRequestMessage request, CancellationToken cancellationToken)
at System.Net.Http.HttpConnectionPool.SendWithNtConnectionAuthAsync(HttpConnection connection, HttpRequestMessage request, Boolean doRequestAuth, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.SendWithRetryAsync(HttpRequestMessage request, Boolean doRequestAuth, CancellationToken cancellationToken)
   at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpClient.FinishSendAsyncBuffered(Task`1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts)
at CodenApp.Studio2Me.VolumeTest.UsefulFunctions.HTTPFunctions`1.Post(String route, T content) in C:\Users\Yasmin Kruger\Documents\Studio2Me\Studio2Me\Tests\CodenApp.Studio2Me.VolumeTest\UsefulFunctions\HTTPFunctions.cs:line 29
   at CodenApp.Studio2Me.VolumeTest.Classes.JobTitleData.JobTitleDataGenerator(Int32 x) in C:\Users\Yasmin Kruger\Documents\Studio2Me\Studio2Me\Tests\CodenApp.Studio2Me.VolumeTest\Classes\JobTitleData.cs:line 21
   at CodenApp.Studio2Me.VolumeTest.Program.Main(String[] args) in C:\Users\Yasmin Kruger\Documents\Studio2Me\Studio2Me\Tests\CodenApp.Studio2Me.VolumeTest\Program.cs:line 22
   at CodenApp.Studio2Me.VolumeTest.Program.<Main>(String[] args)

EDIT1 ：

我只是发送一个请求以测试它是否正常工作，我需要至少发送x * 6个JobTitles，而又不计算有更多的类要一起发送，因此我需要一种可以发送大量请求的方法对API的请求。

EDIT2 ：

来自HttpClient的堆栈跟踪：

    System.Net.Http.HttpRequestException: An error occurred while sending the request.
 ---> System.IO.IOException: The response ended prematurely.
   at System.Net.Http.HttpConnection.FillAsync()
   at System.Net.Http.HttpConnection.ReadNextResponseHeaderLineAsync(Boolean foldedHeadersAllowed)
   at System.Net.Http.HttpConnection.SendAsyncCore(HttpRequestMessage request, CancellationToken cancellationToken)
   --- End of inner exception stack trace ---
   at System.Net.Http.HttpConnection.SendAsyncCore(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.SendWithNtConnectionAuthAsync(HttpConnection connection, HttpRequestMessage request, Boolean doRequestAuth, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.SendWithRetryAsync(HttpRequestMessage request, Boolean doRequestAuth, CancellationToken cancellationToken)
   at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpClient.FinishSendAsyncBuffered(Task`1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts)
   at CodenApp.Studio2Me.VolumeTest.UsefulFunctions.HTTPFunctions`1.PostTest(String route, T content) in C:\Users\Yasmin Kruger\Documents\Studio2Me\Studio2Me\Tests\CodenApp.Studio2Me.VolumeTest\UsefulFunctions\HTTPFunctions.cs:line 51

EDIT3：

Main.cs：

using System;
using CodenApp.Studio2Me.VolumeTest.Classes;
using CodenApp.Studio2Me.VolumeTest.UsefulFunctions;

namespace CodenApp.Studio2Me.VolumeTest
{
    class Program
    {
        static async System.Threading.Tasks.Task Main(string[] args)
        {
          // await JobTitleData.JobTitleDataGenerator(1);
          await JobTitleData.JobTitleDataGenerator2(1);
        }
    }
}

HTTPFunction.cs：

using System;
using System.Net;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;
using System.Threading.Tasks;
using Easy.Common.Extensions;
using Easy.Common.Interfaces;
using Newtonsoft.Json;
using Shouldly;
using RestClient = Easy.Common.RestClient;

namespace CodenApp.Studio2Me.VolumeTest.UsefulFunctions
{
    public class HTTPFunctions<T> where T : class
    {
        const string APIAddress = "http://localhost:5001/";

        public static async Task Post(string route, T content)
        {
            var endpointUri = new Uri(APIAddress + route);
            ServicePointManager.FindServicePoint(endpointUri).ConnectionLeaseTimeout.ShouldBe(-1);

            var jsonContent = JsonConvert.SerializeObject(content); 
            var contentString = new StringContent(jsonContent, Encoding.UTF8, "application/json");
            contentString.Headers.ContentType = new MediaTypeHeaderValue("application/json"); 

            using IRestClient client = new RestClient();
            HttpResponseMessage response = await client.PostAsync(endpointUri, contentString); //This won't work too
            //client.Timeout.ShouldBe(15.Seconds()); Sometimes cause an TimeOut Exception
            Console.WriteLine(response);
        }

        public static async Task PostTest(string route, T content)
        {
            using (var client = new HttpClient())
            {
                client.BaseAddress = new Uri(APIAddress);
                client.DefaultRequestHeaders.Accept.Clear();
                client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

                try
                {
                    HttpResponseMessage response = await client.PostAsJsonAsync(route, content).ConfigureAwait(false); //still not working            
                    if(!response.IsSuccessStatusCode)
                    {
                        Console.WriteLine(content);
                    }
                }
                catch(Exception e)
                {
                    //Using this just to get exception
                    Console.WriteLine(e.Message);
                }
            }
        }
    }
}

JobTitleData.cs：

using System;
using System.Threading.Tasks;
using Bogus;
using CodenApp.Studio2Me.Core.Entities.StoreEntities;
using CodenApp.Studio2Me.VolumeTest.UsefulFunctions;

namespace CodenApp.Studio2Me.VolumeTest.Classes
{
    public class JobTitleData
    {
        public static async Task JobTitleDataGenerator(int x)
        {
            var faker = new Faker("pt_BR");
            
            for(int i = 0; i < x; i++)
            {
                JobTitle jobTitle = new JobTitle();
                jobTitle.Name = faker.Name.JobTitle();
                jobTitle.StoreId = 1;

                await HTTPFunctions<JobTitle>.Post("v1/Store/JobTitles", jobTitle);
            }
        }

        public static async Task JobTitleDataGenerator2(int x)
        {
            var faker = new Faker("pt_BR");
            
            for(int i = 0; i < x; i++)
            {
                JobTitle jobTitle = new JobTitle();
                jobTitle.Name = faker.Name.JobTitle();
                jobTitle.StoreId = 1;

                await HTTPFunctions<JobTitle>.PostTest("v1/Store/JobTitles", jobTitle);
            }
        }
    }
}

与@Andy讨论了对代码的几次更改，并且它们对我返回了相同的错误，我正在其他机器上进行测试，并尝试通过Insomnia调用相同的路由来检查它是否不是没有已配置。现在，它认为这是服务器阻止的，因为我什至无法返回对象响应。

建议的更改：

using (var msg = new HttpRequestMessage(HttpMethod.Post, new UriBuilder(APIAddress) { Path = route }.Uri))
{
    msg.Content = new StringContent(JsonConvert.SerializeObject(content), Encoding.UTF8, "application/json");
            using (var resp = await _client.SendAsync(msg))
            {
                resp.EnsureSuccessStatusCode();
                await resp.Content.ReadAsStringAsync();
            }
        }
    }
}

EDIT4：

经过大量测试并使用了不同的程序来调用路由，我注意到这确实是服务器问题，更确切地说是HTTP认证，因为它是阻止调用的人。我将对该项目进行更改以获取更多信息，然后在edit5中返回已确定的内容并发布答案以最终确定该问题。

2 个答案:

答案 0 :(得分：2)

所以我相信您的问题出在这行上：

HttpResponseMessage response = await client.PostAsJsonAsync(route, 
    content).ConfigureAwait(false); //still not working            
if(!response.IsSuccessStatusCode)
{
    Console.WriteLine(content);
}

您尚未阅读任何内容。您刚得到响应对象。您必须使用该响应来执行此操作：

var objectReturned = await response.Content.ReadAsAsync<WhateverObject>();

或进行测试：

var stringDataReturned = await response.Content.ReadAsStringAsync();

典型情况如下：

var response = await client.PostAsJsonAsync(route, content);
repsonse.EnsureSuccessStatusCode();

var data = await response.ReadAsStringAsync();
Console.WriteLine(data);

答案 1 :(得分：0)

很长一段时间后，我发现了最大的问题。由于我使用VSCode进行编程，所以我没有想到我应该对在本地运行项目后立即创建的.vscode文件夹进行任何更改。对于正在使用并出现错误您的连接不是私有的（与不安全相同）的用户，您必须通过文件{{1 }}或launch.json，我直接在program.cs上进行了修改。

launch.json修改前：

launch.json

{ "name": ".NET Core Launch (api)", "type": "coreclr", "request": "launch", "preLaunchTask": "build", "program": "${workspaceFolder}/Src/CodenApp.Studio2Me.Api/bin/Debug/netcoreapp3.1/CodenApp.Studio2Me.Api.dll", "args": [], "cwd": "${workspaceFolder}/Src/CodenApp.Studio2Me.Api", "stopAtEntry": false, "serverReadyAction": { "action": "openExternally", "pattern": "^\\s*Now listening on:\\s+(https?://\\S+)" }, "env": { "ASPNETCORE_ENVIRONMENT": "Development" }, "sourceFileMap": { "/Views": "${workspaceFolder}/Views" } } 修改后：

launch.json

我只需要添加行{ "name": ".NET Core Launch (api)", "type": "coreclr", "request": "launch", "preLaunchTask": "build", "program": "${workspaceFolder}/Src/CodenApp.Studio2Me.Api/bin/Debug/netcoreapp3.1/CodenApp.Studio2Me.Api.dll", "args": [], "cwd": "${workspaceFolder}/Src/CodenApp.Studio2Me.Api", "stopAtEntry": false, "serverReadyAction": { "action": "openExternally", "pattern": "^\\s*Now listening on:\\s+(https?://\\S+)" }, "env": { "ASPNETCORE_ENVIRONMENT": "Development", "ASPNETCORE_URLS": "http://localhost:5001" }, "sourceFileMap": { "/Views": "${workspaceFolder}/Views" } } 即可消除“不安全”错误，并且应用程序可以正常运行。

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