Check HTTP Header before download in Save-WebFile.ps1

Prevent mistakenly downloading http contents indicating 404 error

Author: KatsuhiroWatanabe

Public/Functions/Other/Save-WebFile.ps1

@@ -116,13 +116,17 @@ function Save-WebFile {
         else {
             Write-Verbose "cURL Source: $SourceUrl"
             Write-Verbose "Destination: $DestinationFullName"
-    
-            if ($host.name -match 'ConsoleHost') {
-                Invoke-Expression "& curl.exe --insecure --location --output `"$DestinationFullName`" --url `"$SourceUrl`""
-            }
-            else {
-                #PowerShell ISE will display a NativeCommandError, so progress will not be displayed
-                $Quiet = Invoke-Expression "& curl.exe --insecure --location --output `"$DestinationFullName`" --url `"$SourceUrl`" 2>&1"
+            $Headers = Invoke-Expression "& curl.exe --head --silent --insecure --location --url `"$SourceUrl`""
+            if ($Headers[0] -match "200.+OK") {
+                if ($host.name -match 'ConsoleHost') {
+                    Invoke-Expression "& curl.exe --insecure --location --output `"$DestinationFullName`" --url `"$SourceUrl`""
+                }
+                else {
+                    #PowerShell ISE will display a NativeCommandError, so progress will not be displayed
+                    $Quiet = Invoke-Expression "& curl.exe --insecure --location --output `"$DestinationFullName`" --url `"$SourceUrl`" 2>&1"
+                }
+            } else {
+                Write-Warning "Header status: $($headers[0])"
             }
         }
         #=================================================