Powershell通过HTTP使用代理下载并检查远程文件大小在第二个文件上失败

我有一个我正在开发的PowerShell脚本，它将通过代理服务器上的HTTP服务器下载文件，并在服务器上包含UN / PW。

我有文件下载好，但一些文件是非常大的，所以我一直在添加一个函数来检查文件是否已经改变（检查大小）。 这适用于第一个文件。 但是它在这一行的第二个文件中超时：

$test = $wc2.OpenRead($source) | Out-Null) 

下面列出了我的脚本的代码，不包括凭证。 我很感激关于如何正确地closures连接（正如我怀疑没有发生）或如何使用Powershell通过HTTP获取远程文件大小的build议。

 Function getWebClient { $webClient = new-object System.Net.WebClient $pxy = new-object System.Net.WebProxy $proxy $pxy.Credentials = New-Object System.Net.NetworkCredential ("tnad\$proxy_un", "$proxy_pw") $webClient.proxy=$pxy $webClient.Headers.Add("user-agent", "Windows Powershell WebClient Header") $WebClient.Credentials = New-Object System.Net.Networkcredential($un, $pw) return $WebClient } foreach ($ds in $datasetsTest) { Write-Host "Checking: $ds" $source = "$server$ds" $dest = "$destFolder$ds" #Test whether the destination file already exists, if it exists, compare file sizes. $destExists = Test-Path $dest if($destExists -eq $false) { Try { $wc1 = getWebClient $wc1.DownloadFile($source, $dest) $wc1.Dispose() Write-Host "File downloaded" -foregroundcolor "green" } Catch { Write-Host "Downloading $ds failed..." -foregroundcolor "red" } } else { $localFileSize = (Get-Item $dest).length $wc2 = getWebClient $test = $wc2.OpenRead($source) | Out-Null $wc2.Dispose() $remoteFileSize = $wc2.ResponseHeaders["Content-Length"] Write-Host "Local file size: $localFileSize, remote file size: $remoteFileSize" if(!($localFileSize -eq $remoteFileSize)) { #file exists, but the server version changed... Try { Remove-Item $dest $wc3 = getWebClient $wc3.DownloadFile($source, $dest) $wc3.Dispose($true) Write-Host "File downloaded" -foregroundcolor "green" } Catch { Write-Host "Downloading $ds failed..." -foregroundcolor "red" } } else { Write-Host "Skipping, file exists and hasn't changed" -foregroundcolor "magenta" } } } 

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 $test = $wc2.OpenRead($source) | Out-Null