fix: increase web console capacity and add frontend retry

channel/web/static/js/console.js

@@ -763,6 +763,10 @@ function sendMessage() {
         }));
     }
 
+    const MAX_RETRIES = 2;
+    const RETRY_DELAY_MS = 1000;
+
+    function postWithRetry(attempt) {
         fetch('/message', {
             method: 'POST',
             headers: { 'Content-Type': 'application/json' },
@@ -783,11 +787,24 @@ function sendMessage() {
             }
         })
         .catch(err => {
+            if (err.name === 'AbortError') {
                 loadingEl.remove();
-        addBotMessage(err.name === 'AbortError' ? t('error_timeout') : t('error_send'), new Date());
+                addBotMessage(t('error_timeout'), new Date());
+                return;
+            }
+            if (attempt < MAX_RETRIES) {
+                console.warn(`[sendMessage] attempt ${attempt + 1} failed, retrying...`, err);
+                setTimeout(() => postWithRetry(attempt + 1), RETRY_DELAY_MS * (attempt + 1));
+                return;
+            }
+            loadingEl.remove();
+            addBotMessage(t('error_send'), new Date());
         });
     }
 
+    postWithRetry(0);
+}
+
 function startSSE(requestId, loadingEl, timestamp) {
     const es = new EventSource(`/stream?request_id=${encodeURIComponent(requestId)}`);
     activeStreams[requestId] = es;

channel/web/web_channel.py

@@ -454,8 +454,14 @@ class WebChannel(ChatChannel):
         func = web.httpserver.StaticMiddleware(app.wsgifunc())
         func = web.httpserver.LogMiddleware(func)
         server = web.httpserver.WSGIServer(("0.0.0.0", port), func)
-        # Allow concurrent requests by not blocking on in-flight handler threads
         server.daemon_threads = True
+        # Default request_queue_size(5) / timeout(10s) / numthreads(10) are
+        # too small: when SSE streams occupy many threads, the backlog fills
+        # and new connections get refused (ERR_CONNECTION_ABORTED).
+        server.request_queue_size = 128
+        server.timeout = 300
+        server.requests.min = 20
+        server.requests.max = 80
         self._http_server = server
         try:
             server.start()