Merge pull request #176649 from Nickomang/master

Added extension installation instructions to HTTP Proxy

Author: PRMerger14

articles/aks/http-proxy.md

@@ -35,6 +35,17 @@ By default, *httpProxy*, *httpsProxy*, and *trustedCa* have no value.
 * An Azure subscription. If you don't have an Azure subscription, you can create a [free account](https://azure.microsoft.com/free).
 * [Azure CLI installed](/cli/azure/install-azure-cli).
 
+### Install the `aks-preview` Azure CLI
+
+You also need the *aks-preview* Azure CLI extension version 0.5.25 or later. Install the *aks-preview* Azure CLI extension by using the [az extension add][az-extension-add] command. Or install any available updates by using the [az extension update][az-extension-update] command.
+
+```azurecli-interactive
+# Install the aks-preview extension
+az extension add --name aks-preview
+# Update the extension to make sure you have the latest version installed
+az extension update --name aks-preview
+```
+
 ### Register the `HTTPProxyConfigPreview` preview feature
 
 To use the feature, you must also enable the `HTTPProxyConfigPreview` feature flag on your subscription.
@@ -142,4 +153,6 @@ az aks update -n $clusterName -g $resourceGroup --http-proxy-config aks-proxy-co
 [az-aks-update]: /cli/azure/aks#az_aks_update
 [az-feature-register]: /cli/azure/feature#az_feature_register
 [az-feature-list]: /cli/azure/feature#az_feature_list
-[az-provider-register]: /cli/azure/provider#az_provider_register
+[az-provider-register]: /cli/azure/provider#az_provider_register
+[az-extension-add]: /cli/azure/extension#az_extension_add
+[az-extension-update]: /cli/azure/extension#az-extension-update