如何在PowerShell中运行appCmd以将自定义标头添加到默认网站

Question

Please help me figure out how to properly escape the arguments so they work when calling appcmd inside of powershell.

My script looks like this:

$defaultWebSite = "Default Web Site"
$appCmd = "C:\windows\system32\inetsrv\appcmd.exe"
$addHeaderP3P = "set config ""$defaultWebSite"" -section:system.webServer/httpProtocol /+""customHeaders.[name='P3P',value='policyRef=`\`"/w3c/p3p.xml`\`",CP=`\`"DSP COR NID OUR COM PRE`\`"']`""

Write-Output "Here's the argument string: " $addHeaderP3P



Write-Output "`nInvoke Result:"
Invoke-Expression "$appCmd $addHeaderP3P"


Write-Output "`n& Result:"
& $appCmd --%"$addHeaderP3P"

The output is this when running inside powershell_ise:

PS C:\Users\robert.bratton> D:\Junk\p3pheader.ps1
Here's the argument string: 
set config "Default Web Site" -section:system.webServer/httpProtocol /+"customHeaders.[name='P3P',value='policyRef=\"/w3c/p3p.xml\",CP=\"DSP COR NID OUR COM PRE\"']"

Invoke Result:
Failed to process input: The parameter 'COR' must begin with a / or - (HRESULT=80070057).


& Result:
Failed to process input: The parameter 'NID' must begin with a / or - (HRESULT=80070057).

This works from the command line

"C:\windows\system32\inetsrv\appcmd.exe" set config "Default Web Site" -section:system.webServer/httpProtocol /+"customHeaders.[name='P3P',value='policyRef=\"/w3c/p3p.xml\",CP=\"DSP COR NID OUR COM PRE\"']"

Thanks for your help!

Answer 1

Try it like this:

$env:defaultWebSite = "Default Web Site"
$appCmd = "C:\windows\system32\inetsrv\appcmd.exe"

& $appCmd --% set config "%defaultWebSite%" -section:system.webServer/httpProtocol /+customHeaders.[name='P3P',value='policyRef="/w3c/p3p.xml",CP="DSP COR NID OUR COM PRE"']

If you use any variables after the --% the have to be environment variables.