417对tableau restapi powershell脚本的预期失败

我在powershell相对较新，尝试使用powershell版本5.1创建REST API调用，调用tableau服务器（版本2018.1），但是我遇到了一个无法摆脱的错误。我要传递的代码如下：

    #Variables:
$sites = 'site'
$APiversion = '3.0'
$DeployPassword = 'Password123'
$DeployUser = 'Defaultuser'
$Tableauservername = 'servername'

# generate body for sign in
$signin_body = (’<tsRequest>
 <credentials name=“’ + $DeployUser + ’” password=“’+ $DeployPassword + ’” >
   <site contentUrl=“” />
 </credentials>
</tsRequest>’)
#[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
$response = Invoke-RestMethod -Uri https://$Tableauservername/api/3.0/auth/signin -Body $signin_body -Method post -UseBasicParsing

有人知道我做错了什么吗

---

我已经更改了引号等的格式。似乎不起作用。

尝试使用

-Headers

参数设置Expect标头。我已经尝试过，但不知道该放在那里什么，它应该放在正文中还是放在rest方法中？您尝试过

-header@{}

或

-header@{Expect=”“}

可能？我重新启动了powershell控制台，它似乎（暂时）解决了可能重复的问题

    417 Expectation Failed

Expectation Failed
The expectation given in the Expect request-header
field could not be met by this server.
The client sent
    Expect: 100-continue

Only the 100-continue expectation is supported.


At line:16 char:13
+ $response = Invoke-RestMethod -Uri https://$Tableauservername/api/3.0 ...
+             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (System.Net.HttpWebRequest:HttpWebRequest) [Invoke-RestMethod], WebException
    + FullyQualifiedErrorId : WebCmdletWebResponseException,Microsoft.PowerShell.Commands.InvokeRestMethodCommand