Fix CORS preflight blocking browser event tracking.

Allow Content-Type on API responses so /events and /feedback POSTs from the site succeed; flush key funnel events immediately.

Author: 1h8s

counter-worker.js

@@ -22,6 +22,7 @@ function corsHeaders(origin) {
   return {
     "Access-Control-Allow-Origin": ALLOWED.indexOf(origin) >= 0 ? origin : ALLOWED[0],
     "Access-Control-Allow-Methods": "GET, POST, OPTIONS",
+    "Access-Control-Allow-Headers": "Content-Type",
     "Cache-Control": "no-store",
     "Content-Type": "application/json"
   };

en/index.html

@@ -4037,10 +4037,11 @@ <h2 class="rise" style="--d:0">How it works</h2>
   } catch (e) { return 'anon'; }
 })();
 var TRACK_Q = [], TRACK_TIMER = 0, TRACK_PINS_SENT = false;
+var TRACK_FLUSH_NOW = { solve_ok: 1, solve_fail: 1, solve_empty: 1, wizard_open: 1, wizard_done: 1, wizard_done_partial: 1 };
 function trackEvent(name) {
   if (!TRACK_EVENTS[name]) return;
   TRACK_Q.push({ e: name, t: Date.now() });
-  if (TRACK_Q.length >= 8) trackFlush();
+  if (TRACK_Q.length >= 8 || TRACK_FLUSH_NOW[name]) trackFlush();
   else if (!TRACK_TIMER) TRACK_TIMER = setTimeout(trackFlush, 4000);
 }
 function trackFlush() {

index.html

@@ -4102,10 +4102,11 @@ <h2 class="rise" style="--d:0">Как это работает</h2>
   } catch (e) { return 'anon'; }
 })();
 var TRACK_Q = [], TRACK_TIMER = 0, TRACK_PINS_SENT = false;
+var TRACK_FLUSH_NOW = { solve_ok: 1, solve_fail: 1, solve_empty: 1, wizard_open: 1, wizard_done: 1, wizard_done_partial: 1 };
 function trackEvent(name) {
   if (!TRACK_EVENTS[name]) return;
   TRACK_Q.push({ e: name, t: Date.now() });
-  if (TRACK_Q.length >= 8) trackFlush();
+  if (TRACK_Q.length >= 8 || TRACK_FLUSH_NOW[name]) trackFlush();
   else if (!TRACK_TIMER) TRACK_TIMER = setTimeout(trackFlush, 4000);
 }
 function trackFlush() {