HttpClient.GetAsync() 在 Azure Function 上获取数据时给出 AggregateException

如何解决HttpClient.GetAsync() 在 Azure Function 上获取数据时给出 AggregateException

我正在尝试使用 URL 从 Zoho 获取员工数据：

https://people.zoho.com/people/api/forms/P_EmployeeView/records

使用 HttpClient 的 GetAsync()。在我的本地开发环境中执行代码时，代码运行流畅并获取所需的数据，但是一旦我将代码发布到 azure 函数，我就会收到以下堆栈跟踪异常：

2021-06-01T06:14:45.870 [Error] System.AggregateException: One or more errors occurred. (One or
 more errors occurred. (A connection attempt Failed because the connected party did not properly 
respond after a period of time,or established connection Failed because connected host has Failed 
to respond.))---> System.AggregateException: One or more errors occurred. (A connection attempt 
Failed because the connected party did not properly respond after a period of time,or established 
connection Failed because connected host has Failed to respond.)---> 
System.Net.Http.HttpRequestException: A connection attempt Failed because the connected party did 
not properly respond after a period of time,or established connection Failed because connected 
host has Failed to respond.---> System.Net.sockets.socketException (10060): A connection attempt 
Failed because the connected party did not properly respond after a period of time,or established 
connection Failed because connected host has Failed to respond.at 
System.Net.Http.ConnectHelper.ConnectAsync(String host,Int32 port,CancellationToken 
cancellationToken)--- End of inner exception stack trace ---at 
System.Net.Http.ConnectHelper.ConnectAsync(String host,CancellationToken 
cancellationToken)at System.Net.Http.httpconnectionPool.ConnectAsync(HttpRequestMessage request,Boolean allowHttp2,CancellationToken cancellationToken)at 
System.Net.Http.httpconnectionPool.CreateHttp11ConnectionAsync(HttpRequestMessage request,CancellationToken cancellationToken)at 
System.Net.Http.httpconnectionPool.GethttpconnectionAsync(HttpRequestMessage request,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.DiagnosticsHandler.SendAsync(HttpRequestMessage request,CancellationToken cancellationToken)at System.Net.Http.HttpClient.FinishSendAsyncBuffered(Task`1 
sendTask,HttpRequestMessage request,CancellationTokenSource cts,Boolean disposeCts)--- End of 
inner exception stack trace ---at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean 
includeTaskCanceledExceptions)at System.Threading.Tasks.Task`1.GetResultCore(Boolean 
waitCompletionNotification)at System.Threading.Tasks.Task`1.get_Result()at 
EmployeeDataRefresh.ZohoClient.GetEmployeeData(ILogger log) in 
C:\Projects\ZohoAttendance\Internal-Automation-and-Power-BI-Dashboard-zoho-employee-data-
update\src\EmployeeDataRefresh\EmployeeDataRefresh\ZohoClient.cs:line 39--- End of inner exception
 stack trace ---at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean 
includeTaskCanceledExceptions)at System.Threading.Tasks.Task`1.GetResultCore(Boolean 
waitCompletionNotification)at System.Threading.Tasks.Task`1.get_Result()at 
EmployeeDataRefresh.Trigger.DoRefresh(ILogger log) in C:\Projects\ZohoAttendance\Internal-
Automation-and-Power-BI-Dashboard-zoho-employee-data-
update\src\EmployeeDataRefresh\EmployeeDataRefresh\Trigger.cs:line 68at 
EmployeeDataRefresh.Trigger.AutoRefreshEmployeeData(TimerInfo myTimer,ILogger log) in 
C:\Projects\ZohoAttendance\Internal-Automation-and-Power-BI-Dashboard-zoho-employee-data-
update\src\EmployeeDataRefresh\EmployeeDataRefresh\Trigger.cs:line 30

这是我获取数据的代码

using(var httpClient = new HttpClient())
{
    httpClient.DefaultRequestHeaders.Authorization
             = new AuthenticationHeaderValue("Bearer",_authToken);
    Uri myUri = new Uri(_url,UriKind.Absolute);
    var response = httpClient.GetAsync(myUri);
    log.Loginformation(_authToken);
    log.Loginformation("Sending Get Request to Zoho...\n");
    var data = await response.Result.Content.ReadAsstringAsync();
    log.Loginformation("Data fetched from Zoho...\n");
    var employes = JsonConvert.DeserializeObject<List<Employee>>(data);

    return employes;
}

我在行中收到错误

var data = await response.Result.Content.ReadAsstringAsync();

我已经放置了各种日志语句来调试问题，最后打印在 azure 函数日志上的日志语句是“向 Zoho 发送获取请求...”。我已经打印了令牌和其他必需的变量，以检查它们是否具有正确的值以及它们是否获得了正确的值，因此无效的令牌绝对不是问题。有人可以建议此错误的可能原因是什么吗？

解决方法

你期待 json 响应类型吗？为了最佳实践，您可能需要在 httpclient 的标头中提供

string contentTypeValue = "application/json";
client.DefaultRequestHeaders.Add("Content-Type",contentTypeValue);

还要练习

 httpResponse.EnsureSuccessStatusCode(); // throws if not 200-299

在读取结果流之前。

这里没有令牌或任何身份验证的问题，只需清除异步编程，首先，相反，通过获取 response.Result 属性的值，您强制当前线程等待直到异步操作完成，第二个我会推荐

static readonly HttpClient client = new HttpClient();
    try
    {
        httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer",_authToken);
        Uri myUri = new Uri(_url,UriKind.Absolute);
        HttpResponseMessage response = await client.GetAsync(_url);
        var data = await response.Result.Content.ReadAsStringAsync();
        var employes = JsonConvert.DeserializeObject<List<Employee>>(data);
    }
    catch (Exception)
    {

        throw;
    }