pat inject: Allow configurable error pages. Can be disabled by adding pat-inject-errorhandler.off to the URL's query string.

Author: thet

CHANGES.md

@@ -54,7 +54,7 @@
 -   pat tabs: Refactor based on ``ResizeObserver`` and fix problems calculating the with with transitions.
 -   pat tabs: When clicking on the ``extra-tabs`` element, toggle between ``open`` and ``closed`` classes to allow opening/closing an extra-tabs menu via CSS.
 -   pat autofocus: Do not autofocus in iframes. Fixes: #761.
--   pat inject: Allow configurable error pages.
+-   pat inject: Allow configurable error pages. Can be disabled by adding ``pat-inject-errorhandler.off`` to the URL's query string.
 
 ### Technical
 

src/pat/inject/documentation.md

@@ -335,6 +335,9 @@ The code looks for a meta tag with the name ``pat-inject-`` plus the HTTP status
 
 Another example: You can present the user with a login page in case the session has expired (``401`` error).
 
+You can disable this behavior for debugging by adding the following parameter to the query string:
+``pat-inject-errorhandler.off``.
+
 ### Options reference
 
 You can customise the behaviour of injection through options in the `data-pat-inject` attribute.

src/pat/inject/inject.js

@@ -677,10 +677,15 @@ const inject = {
                 "It seems, the server is down. Please make a screenshot and contact support. Thank you!";
         }
 
+        const url_params = new URLSearchParams(window.location.search);
+
         const fallback_url = document
             .querySelector(`meta[name=pat-inject-${status}]`)
             .getAttribute("content", false);
-        if (fallback_url) {
+        if (
+            fallback_url &&
+            url_params.get("pat-inject-errorhandler.off") === null
+        ) {
             try {
                 const fallback_response = await fetch(fallback_url, {
                     method: "GET",