Adds a rule to proxy yourhost.example.com to localhost:yourportnumber with IIS Url Rewrite

Add-RewriteRule.ps1

param (
	[string]$domain,
	[string]$hostName,
	[string]$port
)

$ruleName = "$hostName-inbound"
$publicHost = "$hostName.$domain"
$privateHost = "http://localhost:$port/{R:1}"

$path = "MACHINE/WEBROOT/APPHOST/Default Web Site"

Add-WebConfigurationProperty -pspath $path -filter "system.webServer/rewrite/rules" -name "." -value @{name=$ruleName;stopProcessing='True'}
Set-WebConfigurationProperty -pspath $path -filter "system.webServer/rewrite/rules/rule[@name='$hostName-inbound']/match" -name "url" -value "(.*)"

Add-WebConfigurationProperty -pspath $path -filter "system.webServer/rewrite/rules/rule[@name='$hostName-inbound']/conditions" -name "." -value @{input='{HTTP_POST}';pattern=$publicHost}
Set-WebConfigurationProperty -pspath $path -filter "system.webServer/rewrite/rules/rule[@name='$hostName-inbound']/action" -name "type" -value "Rewrite"
Set-WebConfigurationProperty -pspath $path -filter "system.webServer/rewrite/rules/rule[@name='$hostName-inbound']/action" -name "url" -value $privateHost