Merge pull request #189938 from craigshoemaker/swa/referrer

[Static Web Apps] add .referrer token

Author: PRMerger12

articles/static-web-apps/authentication-authorization.md

@@ -70,6 +70,21 @@ For example:
 <a href="/.auth/login/github?post_login_redirect_uri=https://zealous-water.azurestaticapps.net/success">Login</a>
 ```
 
+Additionally, you can redirect unauthenticated users back to the referring page after they log in. To configure this behavior, create a [response override](configuration.md#response-overrides) rule that sets `post_login_redirect_uri` to `.referrer`.
+
+For example:
+
+```json
+{
+  "responseOverrides": {
+    "401": {
+      "redirect": "/.auth/login/github?post_login_redirect_uri=.referrer",
+      "statusCode": 302
+    }
+  }
+}
+```
+
 ## Logout
 
 The `/.auth/logout` route logs users out from the website. You can add a link to your site navigation to allow the user to log out as shown in the following example.