使用ASP.Net .ashx辅助文件调用MASV API无法获取响应求助

我正在用ASP.NET异步HTTP处理程序对接MASV API，代码如下（已隐藏Teams ID和API Key，PackageRequest与UploadPackage是自定义类），但收到错误提示“An error occurred while sending the request.”，已经添加了async/await关键字，不知道问题出在哪。

Imports Newtonsoft.Json
Imports RestSharp

Public Class NewToken Implements IHttpAsyncHandler, IRequiresSessionState

Private _Delegate As AsyncProcessorDelegate
Protected Delegate Sub AsyncProcessorDelegate(context As HttpContext)

Public Function BeginProcessRequest(context As HttpContext, cb As AsyncCallback, extraData As Object) As IAsyncResult Implements IHttpAsyncHandler.BeginProcessRequest
    _Delegate = New AsyncProcessorDelegate(AddressOf ProcessRequest)
    Return _Delegate.BeginInvoke(context, cb, extraData)
End Function

Async Sub ProcessRequest(context As HttpContext) Implements IHttpAsyncHandler.ProcessRequest
    Try
        Dim converted As String = Await new_token()
        context.Response.Write(converted)
    Catch ex As Exception
        Dim whatIsIt As String = ex.Message
    End Try
End Sub

Public Sub EndProcessRequest(result As IAsyncResult) Implements IHttpAsyncHandler.EndProcessRequest
    _Delegate.EndInvoke(result)
End Sub

Public Async Function new_token() As Threading.Tasks.Task(Of String)
    Try
        Dim client As New RestClient("https://api.massive.app/v1")
        Dim request As New RestRequest("teams/ID/packages", Method.Post)
        request.AddHeader("X-Api-Key", "API KEY")
        Dim pkgRequest As New PackageRequest With {
            .description = "MASV",
            .name = "File Upload",
            .recipient = "test@test.com"
        }
        request.AddJsonBody(pkgRequest)
        Dim result As RestResponse(Of UploadPackage) = Await client.ExecuteAsync(Of UploadPackage)(request)
        Dim converted As String = JsonConvert.SerializeObject(result.Data)
        Return converted
    Catch ex As Exception
        Dim whatIsIt As String = ex.Message
        Return Nothing
    End Try
End Function

ReadOnly Property IsReusable() As Boolean Implements IHttpHandler.IsReusable
    Get
        Return False
    End Get
End Property

End Class

排查方向： #

• 先修复API端点：你当前用的https://api.massive.app/v1是错误的，MASV官方API端点是https://api.masv.io/v1，这大概率是报错的核心原因。
• 捕获完整异常：当前代码只拿了ex.Message，很多底层错误（比如证书验证失败、网络超时、序列化错误）藏在InnerException里，修改Catch块打印完整异常信息：

  Catch ex As Exception
      Dim fullError = ex.ToString()
      context.Response.Write(fullError)
      Return Nothing
  End Try
  

• 检查自定义类序列化：确保PackageRequest的属性字段和MASV API要求完全匹配，比如是否需要驼峰命名，可通过JsonProperty特性指定：

  Public Class PackageRequest
      <JsonProperty("name")>
      Public Property Name As String
      <JsonProperty("description")>
      Public Property Description As String
      <JsonProperty("recipient")>
      Public Property Recipient As String
  End Class
  

• 验证权限与参数：确认API Key有效且拥有创建Package的权限，同时把teams/ID/packages中的ID替换为真实的团队ID。
• 检查网络环境：服务器是否能访问MASV API，有没有防火墙、代理拦截了请求。

内容的提问来源于stack exchange，提问作者Matt