FIX: preserve query params in URL path and decode query parameter

Author: IoannisNezis

CHANGELOG.md

@@ -15,6 +15,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 
 - Connection errors no longer show "(undefined)"; they now display the actual network error and hint at common causes (server down, wrong endpoint URL, CORS)
+- Reflecting the loaded backend in the URL path no longer drops query parameters (e.g. `?query=...`)
+- The `query` URL parameter is now URI-decoded before opening it in a tab
 
 ## [0.5.0] - 2026-06-32
 

frontend/src/backend/backends.ts

@@ -116,7 +116,7 @@ export async function configureBackends(editor: Editor) {
   }
   // NOTE: reflect the loaded backend in the URL path when none was specified.
   if (path_slug === undefined && activeEndpointSlug) {
-    history.replaceState(null, '', `${BASE_PATH}${activeEndpointSlug}`);
+    history.replaceState(null, '', `${BASE_PATH}${activeEndpointSlug}${window.location.search}`);
   }
   // NOTE: remember the loaded backend so a new tab without a path reuses it.
   if (activeEndpointSlug) {

frontend/src/request_params.ts

@@ -24,7 +24,7 @@ export async function handleRequestParameter(editor: Editor) {
   } else {
     const query = params.get('query');
     if (query) {
-      await openOrCreateTab(editor, undefined, query);
+      await openOrCreateTab(editor, undefined, decodeURIComponent(query));
     }
   }
   const exec = params.get('exec');