How to get/add/changed allowed server variables of IIS Web Site with PowerShell? - powershell

Question

I'm trying to make a PS script that creates an IIS web page, configures a reverse proxy via URL Rewrite and I'm stuck on how to add allowed server variables via PowerShell.
Does anyone know how to add these variables via powershell for the IIS website?

Answer 1

UPDATE: I have solved this problem
Step 1. Unlock server configuration section
%windir%\system32\inetsrv\appcmd.exe unlock config -section:system.webServer/rewrite/allowedServerVariables
Now it's posible to get allowed server variables with
import-module WebAdministration
$webSiteName = "your-site-name"
$allowedServerVariables = Get-WebConfigurationProperty -PSPath "MACHINE/WEBROOT/APPHOST/${webSiteName}" -filter "system.webServer/rewrite/allowedServerVariables/add" -Name name
Write-Host $allowedServerVariables.Value
Example for adding server variables
import-module WebAdministration
$webSiteName = "your-web-site-name"
add-webconfigurationproperty -pspath "iis:\sites\${webSiteName}" -filter "system.webserver/rewrite/allowedservervariables" -name "." -value #{name='HTTP_X_ORIGINAL_ACCEPT_ENCODING'}
UPDATE 2
Better solution without PowerShell is to add allowed server variables globally on IIS web server. So each variable will be automatically inherited from new web site.

Answer 2

FYI adding server variable on server level by powershell:
Add-WebConfiguration /system.webServer/rewrite/allowedServerVariables -atIndex 0 -value #{name="RESPONSE_SERVER"}
this will add the following configuration in applicationhost.config
<system.webServer>
...
<rewrite>
...
<allowedServerVariables>
<add name="RESPONSE_SERVER" />
</allowedServerVariables>
...
</rewrite>
</system.webServer>