added export gpx

Cargo.lock

@@ -1590,7 +1590,7 @@ dependencies = [
 
 [[package]]
 name = "rs_maps"
-version = "0.3.1"
+version = "0.3.4"
 dependencies = [
  "anyhow",
  "argon2",

Cargo.toml

@@ -1,7 +1,7 @@
 # Cargo.toml
 [package]
 name = "rs_maps"
-version = "0.3.1"
+version = "0.3.4"
 edition = "2021"
 
 [dependencies]

frontend/app.js

@@ -26,7 +26,20 @@ const NOMINATIM = 'https://nominatim.openstreetmap.org/search';
 // Nominatim's search endpoint doesn't return object tags, so opening hours,
 // phone and website need a second lookup by OSM id. Overpass is donated
 // infrastructure like Nominatim: fine on an explicit click, not per result.
-const OVERPASS = 'https://overpass-api.de/api/interpreter';
+//
+// Tried in order. The main overpass-api.de instance is by far the busiest and
+// returns 504 under load even for a trivial single-object query, so the mirrors
+// are a practical necessity rather than belt and braces.
+const OVERPASS_ENDPOINTS = [
+  'https://overpass.kumi.systems/api/interpreter',
+  'https://overpass-api.de/api/interpreter',
+  'https://overpass.private.coffee/api/interpreter',
+];
+
+// Overpass queues requests when busy — a trivial single-object lookup has been
+// observed taking over a minute before returning a perfectly good 200. 30s is
+// the most that's reasonable to make someone wait; past that, give up quietly.
+const OVERPASS_TIMEOUT_MS = 30000;
 
 const COLOURS = ['#4E9C6B', '#D2467F', '#E2A93C', '#4E8FC9', '#B07BD4', '#D3574B'];
 const DEFAULT_COLOUR = COLOURS[0];
@@ -693,16 +706,40 @@ async function fetchOsmTags(osmType, osmId) {
   const short = OSM_SHORT[osmType];
   if (!short) return null;
 
-  const query = `[out:json][timeout:20];${short}(${osmId});out tags;`;
-  const res = await fetch(OVERPASS, {
-    method: 'POST',
-    headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
-    body: 'data=' + encodeURIComponent(query),
-  });
-  if (!res.ok) throw new Error('overpass ' + res.status);
+  // Server-side budget matched to ours, so it sheds the request rather than
+  // holding it in a queue we've already stopped waiting on.
+  const query = `[out:json][timeout:30];${short}(${osmId});out tags;`;
+  let lastError = null;
 
-  const body = await res.json();
-  return (body.elements && body.elements[0] && body.elements[0].tags) || {};
+  for (const endpoint of OVERPASS_ENDPOINTS) {
+    // AbortController rather than relying on the server: a hung connection
+    // would otherwise block the fallback for as long as the browser allows.
+    const abort = new AbortController();
+    const timer = setTimeout(() => abort.abort(), OVERPASS_TIMEOUT_MS);
+
+    try {
+      const res = await fetch(endpoint, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
+        body: 'data=' + encodeURIComponent(query),
+        signal: abort.signal,
+      });
+
+      // 429 and 504 mean this mirror is busy, not that the object is missing —
+      // worth asking someone else.
+      if (!res.ok) throw new Error('overpass ' + res.status);
+
+      const body = await res.json();
+      return (body.elements && body.elements[0] && body.elements[0].tags) || {};
+    } catch (err) {
+      lastError = err;
+      console.warn('overpass mirror failed:', endpoint, err.message);
+    } finally {
+      clearTimeout(timer);
+    }
+  }
+
+  throw lastError || new Error('no overpass endpoint responded');
 }
 
 /* Renders whatever came back. Deliberately raw values — no "open now", no
@@ -873,9 +910,11 @@ function showSearchHit(hit) {
           slot.replaceChildren(node);
           more.remove();
         } catch {
+          // Overpass being busy is routine and not worth interrupting anyone
+          // over. The button simply comes back so it can be pressed again;
+          // the reason stays in the console.
           more.disabled = false;
           more.textContent = 'More details';
-          toast('Could not load details right now', true);
         }
         popup.update();   // re-measure after the content grew
       });
@@ -1071,6 +1110,18 @@ async function loadGpxList() {
     edit.addEventListener('click', () => editRoute(f.name));
     li.appendChild(edit);
 
+    // A plain anchor rather than a fetch-and-blob: same-origin navigation
+    // carries the session cookie, and the browser handles the save dialog,
+    // resumability and large files without any of it passing through JS.
+    const download = document.createElement('a');
+    download.className = 'link';
+    download.textContent = 'Download';
+    download.href = 'api/gpx/file/' + encodeURIComponent(f.name);
+    // Without an explicit filename the browser would name it after the URL's
+    // last segment, which is percent-encoded.
+    download.download = f.name;
+    li.appendChild(download);
+
     list.appendChild(li);
   });
 }