capture response headers for rate limiting info

Author: JohnDuprey

Modules/CIPPCore/Public/Entrypoints/HTTP Functions/CIPP/Core/Invoke-ListGraphRequest.ps1

@@ -124,6 +124,11 @@ function Invoke-ListGraphRequest {
 
     try {
         $Results = Get-GraphRequestList @GraphRequestParams
+
+        if ($script:LastGraphResponseHeaders) {
+            $Metadata.GraphHeaders = $script:LastGraphResponseHeaders
+        }
+
         if ($Results | Where-Object { $_.PSObject.Properties.Name -contains 'nextLink' }) {
             if (![string]::IsNullOrEmpty($Results.nextLink) -and $Request.Query.TenantFilter -ne 'AllTenants') {
                 Write-Host "NextLink: $($Results.nextLink | Where-Object { $_ } | Select-Object -Last 1)"

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

@@ -73,15 +73,14 @@ function New-GraphGetRequest {
                         Headers     = $headers
                         ContentType = 'application/json; charset=utf-8'
                     }
-                    if ($IncludeResponseHeaders) {
-                        $GraphRequest.ResponseHeadersVariable = 'ResponseHeaders'
-                    }
 
                     if ($ReturnRawResponse) {
                         $GraphRequest.SkipHttpErrorCheck = $true
                         $Data = Invoke-WebRequest @GraphRequest
                     } else {
+                        $GraphRequest.ResponseHeadersVariable = 'ResponseHeaders'
                         $Data = (Invoke-RestMethod @GraphRequest)
+                        $script:LastGraphResponseHeaders = $ResponseHeaders
                     }
 
                     # If we reach here, the request was successful