powershell - 如何在Powershell中转义Invoke-Webrequest

Question

我有一个带有状态页面的网络设备，该页面可以通过Java小程序访问。使用Fiddler，我可以找到状态的http提要，但是页面会不断刷新。 (Firefox会显示该页面，但会保持刷新状态，Chrome会将其视为无扩展名的文件，并尝试保存它，但由于总有更多数据，因此无法完成。)

状态页面使用NTLM身份验证，因此尽管我将使用Invoke-Webrequest。以下代码登录并开始下载页面，但是由于其恒定的数据流永远无法完成:

$url = "http://xxx.xxx.xxx.xxx/api/notify"
$user = "user"
$pass= "password"
$secpasswd = ConvertTo-SecureString $pass -AsPlainText -Force
$credential = New-Object System.Management.Automation.PSCredential($user, $secpasswd)
$data = Invoke-restmethod $url -Credential $credential

收到一定数量的字符后，是否有办法从Invoke-Webrequest中逃脱？还是有更好的方法来做到这一点？

Answer 1

我认为Invoke-WebRequest不可行，但是您可以改用.NET WebRequest和StreamReader类。例:

$sUri = "http://www.w3.org" # Replace with your URI
$sEncoding = "utf-8"
$iCharactersToRead = 1000 # How many characters we want to read
$sAuthType = "NTLM"
$sUserName = "username"
$sPassword = "password"

# Creating a new HttpWebRequest object.
[System.Net.HttpWebRequest]$oHttpWebRequest = [System.Net.WebRequest]::Create($sUri)
# This may be superflous if your HTTP server doesn't use compression.
$oHttpWebRequest.AutomaticDecompression = `
        ([System.Net.DecompressionMethods]::Deflate `
    -bor [System.Net.DecompressionMethods]::GZip)

# Since you have NTLM auth, you need to add a credential.
$oCredential = New-Object -TypeName System.Net.NetworkCredential($sUserName, $sPassword)
$oCredentialCache = New-Object -TypeName System.Net.CredentialCache
$oCredentialCache.Add($sUri, "NTLM", $oCredential)
$oHttpWebRequest.Credentials = $oCredentialCache

# Creating a StreamReader object that will read the response stream.
$oResponseStream = $oHttpWebRequest.GetResponse().GetResponseStream()
$oContentReader = New-Object -TypeName System.IO.StreamReader($oResponseStream,
    [System.Text.Encoding]::GetEncoding($sEncoding), $true)

# Trying to read the specified number of characters from the stream.
$sContent = [String]::Empty
try {
    for ($i = 0; $i -lt $iCharactersToRead; $i++) { 
        $sContent += [Char]$oContentReader.Read() 
    } 
}
finally {
    $oContentReader.Close()
}

代替 utf-8，您可能需要指定其他编码名称，具体取决于HTTP服务器使用的编码。有关更多详细信息，请参见 Encoding.WebName引用。