req.Proxy = new WebProxy(); // initialize this FtpWebRequest property
FTP upload file The requested FTP command is not supported when using HTTP proxy
-
01-07-2022 - |
题
Can someone please take a look at the code below and tell me what I am doing wrong. I am just going in circles,,, any pointers greatly appreciated
public class FtpWebRequestUtil
{
private static string RemoteHost;
private static string RemoteFtpPath;
public static NetworkCredential Credential = new NetworkCredential();
public FtpWebRequestUtil()
{
}
public FtpWebRequestUtil(string RemoteAddress, string RemotePath, string RemoteUser, string RemotePwd)
{
Credential.UserName = RemoteUser;
Credential.Password = RemotePwd;
RemoteHost = RemoteAddress;
RemoteFtpPath = RemotePath;
}
public string UploadFile(string localFilePath)
{
int startTime = Environment.TickCount;
// Console.WriteLine("Uploading File " + localFilePath);
try
{
FileInfo localFile = new FileInfo(localFilePath); //e.g.: c:\\Test.txt
byte[] buf = new byte[2048];
int iWork;
string remoteFile = "ftp://" + RemoteHost + "/" + RemoteFtpPath + "/" + localFile.Name;
FtpWebRequest req = (FtpWebRequest) FtpWebRequest.Create(remoteFile);
// req.Proxy =
req.Credentials = Credential;
// FtpWebRequest req = (FtpWe
req.UseBinary = true;
req.KeepAlive = true;
req.Method = WebRequestMethods.Ftp.UploadFile;
StreamWriter myStreamWriter = new StreamWriter(req.GetRequestStream());
myStreamWriter.Write(new StreamReader("TestFiles\\" + localFile.Name).ReadToEnd());
myStreamWriter.Close();
FtpWebResponse myFtpWebResponse = (FtpWebResponse) req.GetResponse();
Console.WriteLine("Upload File Complete, status: " + myFtpWebResponse.StatusDescription);
myFtpWebResponse.Close();
return "SUCCESS";
}
catch (Exception ex)
{
Console.WriteLine("There was an error connecting to the FTP Server.");
Console.WriteLine(ex.Message);
throw ex;
}
Console.WriteLine("Time taken for downloading file is " + (Environment.TickCount - startTime).ToString());
return "FAILURE";
}
************************ *********************************
FtpWebRequestUtil ftpClient = new FtpWebRequestUtil(FtpUrl, InputFolder, FtpUser, FtpPassword);
try
{
Thread.Sleep(5000);
ftpClient.UploadFile(UploadingFileName);
}
catch (Exception exception)
{
Assert.Fail(exception.Message);
}
finally
{
ftpClient = null;
}
}
}
解决方案
其他提示
It turns out that only the RETR
, LIST
, and NLST
methods are supported by System.Net.FtpWebRequest
when a HTTP
proxy is configured and it doesn't matter that you are not setting a proxy in your code: if a HTTP
proxy (not FTP
proxy) is configured in the system proxy settings (in i.e. : Internet Options\Connections\LAN setting\Proxy Server\ Use a proxy server for your LAN), then you will get this error when trying to upload to the FTP
server.
The workaround is use IE to change the system settings to switch off the use of the HTTP
proxy. However if you have access to the affected code the solution is to set the Proxy
property of the request to null, for example:
request.Proxy = null;
The exceptions itself is the answer - it is not supported. Probably you have some HTTP proxy that is preventing direct connection to FTP. According to MS documentation, if the specified proxy is an HTTP proxy, only the DownloadFile, ListDirectory, and ListDirectoryDetails commands are supported - so UploadFile is not.