Retry QA server navigation

scripts/qa-representative-battles.mjs

@@ -1273,7 +1273,7 @@ try {
 }
 
 async function setupBattle(page, battle) {
-  await page.goto(targetUrl, { waitUntil: 'domcontentloaded' });
+  await gotoTargetPage(page);
   await page.waitForFunction(() => window.__HEROS_GAME__ !== undefined && window.__HEROS_DEBUG__ !== undefined, undefined, { timeout: 90000 });
   await page.evaluate((selected) => {
     const now = new Date().toISOString();
@@ -1321,7 +1321,7 @@ async function setupCumulativeBattle(page, battle, firstBattle) {
     firstBattle && resumeCampaignSnapshot && campaignSnapshotPath && existsSync(campaignSnapshotPath)
       ? await readFile(campaignSnapshotPath, 'utf8')
       : undefined;
-  await page.goto(targetUrl, { waitUntil: 'domcontentloaded' });
+  await gotoTargetPage(page);
   await page.waitForFunction(() => window.__HEROS_GAME__ !== undefined && window.__HEROS_DEBUG__ !== undefined, undefined, { timeout: 90000 });
   const preparation = await page.evaluate(
     ({ firstBattle, initialSnapshot, labels, protectedUnitIds, selected, slotKey, storageKey }) => {
@@ -1454,6 +1454,38 @@ async function setupCumulativeBattle(page, battle, firstBattle) {
   return preparation;
 }
 
+async function gotoTargetPage(page) {
+  let lastError;
+  for (let attempt = 0; attempt < 3; attempt += 1) {
+    try {
+      await page.goto(targetUrl, { waitUntil: 'domcontentloaded' });
+      return;
+    } catch (error) {
+      lastError = error;
+      if (!isServerConnectionError(error) || attempt === 2) {
+        throw error;
+      }
+      console.log(`QA server connection failed at ${targetUrl}; restarting local server and retrying (${attempt + 1}/2).`);
+      await restartLocalServer();
+    }
+  }
+  throw lastError;
+}
+
+async function restartLocalServer() {
+  if (serverProcess) {
+    serverProcess.kill();
+    serverProcess = undefined;
+    await sleep(1000);
+  }
+  serverProcess = await ensureLocalServer(targetUrl);
+}
+
+function isServerConnectionError(error) {
+  const message = String(error?.message ?? error);
+  return message.includes('ERR_CONNECTION_REFUSED') || message.includes('ECONNREFUSED') || message.includes('ERR_CONNECTION_RESET');
+}
+
 async function normalizeRepresentativeBattleUnits(page, battle) {
   await page.evaluate(
     ({ no, selected, protectedUnitIds }) => {