当使用Invoke-RestMethod或System.Net.WebClient时Office365api超时

Question

我正在创建一个PowerShell脚本，用于从邮箱下载所有带有附件的电子邮件，并在成功下载后从邮箱中删除它们。

我目前使用的是https://outlook.office365.com/EWS/ODATA/me/messages端点。打开浏览器并登录总是成功和快速的(不到1秒的响应)。

但是，试图运行以下PowerShell会返回调用-RestMethod和WebClient的超时。

$cred = Get-Credential

$url = "https://outlook.office365.com/EWS/ODATA/me/messages"
Invoke-RestMethod $url -Credential $cred -Method GET -TimeoutSec 100

$wc = New-Object System.Net.WebClient
$wc.Credentials = $cred
$wc.DownloadString("https://outlook.office365.com/EWS/ODATA/me/messages")

我在几个测试租户中尝试过这一点，还有一些生产租户也有相同的错误。我也尝试过https://outlook.office365.com/api/v1.0/me/messages，但成功甚至更少(在浏览器中不起作用，PowerShell也不起作用)。

而且，不仅消息端点存在此错误，我还尝试了具有相同结果的https://outlook.office365.com/ews/odata/Me/Calendar/。

1. 我没有代理服务器
2. 我尝试过从我的客户网络，我的办公室网络，家庭网络。
3. 有时效果很好，有时根本不起作用。

有人用这个API成功了吗？

Answer 1

听起来你可能遇到了一个已知的问题。如果您增加了超时值，它最终会返回吗？如果是这样的话，并且重复请求，它返回的速度会更快吗？

另外，使用此cmdlet调用端点使用基本身份验证，该身份验证目前在其他端点上启用，但在将来的某个时候将被禁用。

Answer 2

我决定跳过使用这个API，而是使用EWS托管API。下面是有兴趣的人的代码示例：

# Destination folder
$destinationFolder = "C:\Users\username\Downloads\Attachment Downloader"

# replace with your email address
$email    = "email@office365tenant.onmicrosoft.com"
$username = "email@office365tenant.onmicrosoft.com"
$password = "Password123"

# load the assembly
Add-Type -Path "C:\Program Files\Microsoft\Exchange\Web Services\2.2\Microsoft.Exchange.WebServices.dll"

# Create Exchange Service object
$s = New-Object Microsoft.Exchange.WebServices.Data.ExchangeService([Microsoft.Exchange.WebServices.Data.ExchangeVersion]::Exchange2013_SP1)
$s.Credentials = New-Object Net.NetworkCredential($username, $password)
# $s.TraceEnabled = $true
Write-Host "Trying AutoDiscover... "
$s.AutodiscoverUrl($email, {$true})

if(!$s.Url) {
    Write-Error "AutoDiscover failed"
    return;
} else {
    Write-Host -ForegroundColor Green "AutoDiscover succeeded - $($s.Url)"
}

# Create destination folder
$destinationFolder = "{0}\{1}" -f $destinationFolder, (Get-Date -Format "yyyyMMdd HHmmss")
mkdir $destinationFolder | Out-Null

# get a handle to the inbox
$inbox = [Microsoft.Exchange.WebServices.Data.Folder]::Bind($s,[Microsoft.Exchange.WebServices.Data.WellKnownFolderName]::Inbox)

#create a property set (to let us access the body & other details not available from the FindItems call)
$psPropertySet = new-object Microsoft.Exchange.WebServices.Data.PropertySet([Microsoft.Exchange.WebServices.Data.BasePropertySet]::FirstClassProperties)
$psPropertySet.RequestedBodyType = [Microsoft.Exchange.WebServices.Data.BodyType]::Text;

# Find the items
Write-Host "Searching for items in mailbox... " -NoNewline
$items = $inbox.FindItems(500)
Write-Host -ForegroundColor Green "found $($items.items.Count)"

$inc = 0;
foreach ($item in $items.Items)
{
    # Create mail folder
    $inc += 1
    $mailFolder = "{0}\{1}" -f $destinationFolder, $inc; 
    mkdir $mailFolder | Out-Null

    # load the property set to allow us to get to the body
    $item.load($psPropertySet)
    Write-Host ("$inc - $($item.Subject)") -ForegroundColor Yellow

    # save the metadata to a file
    $item | Export-Clixml ("{0}\metadata.xml" -f $mailFolder)

    # save all attachments
    foreach($attachment in $item.Attachments) {
        if($attachment.ContentType -notlike "message/*") {
            Write-Host " - $($attachment.Name) ($($attachment.ContentType))"
            $fileName = "{0}\{1}" -f $mailFolder, $attachment.Name
            $attachment.Load($fileName)
        }
    }

    # delete the mail item
    $item.Delete([Microsoft.Exchange.WebServices.Data.DeleteMode]::HardDelete, $true)
}