http graph rate limit throttle priority

https://learn.microsoft.com/en-us/graph/throttling-limits#request-headers

Author: JohnDuprey

Modules/CIPPCore/Public/Entrypoints/HTTP Functions/New-CippCoreRequest.ps1

@@ -21,6 +21,9 @@ function New-CippCoreRequest {
     }
 
     if ($PSCmdlet.ShouldProcess("Processing request for $($Request.Params.CIPPEndpoint)")) {
+        # Set script scope variables for Graph API to indicate HTTP request/high priority
+        $script:XMsThrottlePriority = 'high'
+
         if ((Get-Command -Name $FunctionName -ErrorAction SilentlyContinue) -or $FunctionName -eq 'Invoke-Me') {
             try {
                 $Access = Test-CIPPAccess -Request $Request

Modules/CIPPCore/Public/GraphHelper/New-GraphBulkRequest.ps1

@@ -17,6 +17,10 @@ function New-GraphBulkRequest {
     if ($NoAuthCheck -or (Get-AuthorisedRequest -Uri $uri -TenantID $tenantid)) {
         $headers = Get-GraphToken -tenantid $tenantid -scope $scope -AsApp $asapp
 
+        if ($script:XMsThrottlePriority) {
+            $headers['x-ms-throttle-priority'] = $script:XMsThrottlePriority
+        }
+
         $URL = "https://graph.microsoft.com/$Version/`$batch"
 
         # Track consecutive Graph API failures

Modules/CIPPCore/Public/GraphHelper/New-GraphGetRequest.ps1

@@ -36,6 +36,11 @@ function New-GraphGetRequest {
         if ($ComplexFilter) {
             $headers['ConsistencyLevel'] = 'eventual'
         }
+
+        if ($script:XMsThrottlePriority) {
+            $headers['x-ms-throttle-priority'] = $script:XMsThrottlePriority
+        }
+
         $nextURL = $uri
         if ($extraHeaders) {
             foreach ($key in $extraHeaders.Keys) {