LibWeb/XHR: Isomorphic decode accessing XMLHttpRequest response headers

Fixes a crash on: https://wpt.live/html/browsers/browsing-the-web/navigating-across-documents/refresh/subresource.any.html
Author: https://github.com/shannonbooth Commit: e74ca82083 Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/3111 Reviewed-by: https://github.com/AtkinsSJ ✅
2025-07-29 12:19:54 +00:00 · 2025-01-03 18:03:42 +13:00 · 2025-01-03 18:03:42 +13:00 · e74ca82083 · 2025-01-15 12:36:55 +00:00
commit e74ca82083
parent 731c2365b6
4 changed files with 47 additions and 14 deletions
--- a/Tests/LibWeb/Text/input/XHR/XMLHttpRequest-response-header-decoding.html
+++ b/Tests/LibWeb/Text/input/XHR/XMLHttpRequest-response-header-decoding.html
@ -0,0 +1,29 @@
+<script src="../include.js"></script>
+<script>
+    asyncTest(async (done) => {
+        try {
+            const httpServer = httpTestServer();
+            const url = await httpServer.createEcho("GET", "/xml-http-request-response-header-decoding", {
+                status: 200,
+                headers: {
+                    "Access-Control-Allow-Origin": "*",
+                    "Access-Control-Expose-Headers": "Refresh",
+                    "Refresh": "0;./refreshed.txt?\u0080\u00FF",
+                },
+                body: "",
+            });
+
+            const xhr = new XMLHttpRequest();
+            xhr.open("GET", url);
+
+            xhr.addEventListener("load", () => {
+                println(`getAllResponseHeaders()\n${xhr.getAllResponseHeaders().replace('\r','')}`);
+                println(`getResponseHeader("Refresh") => '${xhr.getResponseHeader("Refresh")}'`);
+                done();
+            });
+            xhr.send();
+        } catch (err) {
+            console.log("FAIL - " + err);
+        }
+    });
+</script>