Webclient：远程服务器返回一个错误：（401）未授权

Question

我试图上传文件到FTP服务器使用WebClient，但我不断收到同样的错误如下： 远程服务器返回一个错误： （401）未经授权。

正如您可以在代码示例中看到的，我尝试了4种不同的尝试抓取形式的上传方法。你能帮我解决这个问题吗？

Dim wc As New WebClient 
      wc.Credentials = New NetworkCredential(ftp.username, ftp.password) 


      Try 'UploadFile Method (String, String) 
       Dim dddd As Byte() = wc.UploadFile("https://ftp.something/something/something/", serverpath) 
      Catch ex1 As Exception 
       Try 'UploadFile Method (Uri, String) 
        Dim dddd As Byte() = wc.UploadFile(ftp.myUri, serverpath) 
       Catch ex2 As Exception 
        Try 'UploadFile Method(Of String, String, String) 
         Dim dddd As Byte() = wc.UploadFile("https://ftp.something/something/something/", "POST", serverpath) 
        Catch ex33 As Exception 

         Try 'UploadFile Method (Uri, String, String) 
          Dim dddd As Byte() = wc.UploadFile(ftp.myUri, "POST", serverpath) 
         Catch ex As Exception 
         End Try 
        End Try 
       End Try 

      End Try 

Answer 1

问题的解决方案是。

Dim wc As New WebClient() 
      Dim credCache As New CredentialCache() 
      credCache.Add(New Uri("https://ftp.something/something/something/"), "Basic", New NetworkCredential(ftp.username, ftp.password)) 

      wc.Credentials = credCache