switched to SSE transport, seems to work

webroot/script.js

@@ -57,3 +57,12 @@ function gooseAppendMessage(id, type, timestamp, username, text, icon) {
   /* autoscroll to the end */
   window.scrollTo(0, document.body.scrollHeight)
 }
+
+/* entry point, set up an event source */
+window.addEventListener('DOMContentLoaded', function() {
+  var msgSource = new EventSource('/sse')
+  msgSource.onmessage = e => {
+    var msg = JSON.parse(e.data)
+    gooseAppendMessage(msg.id, msg.type, msg.timestamp, msg.username, msg.text, msg.icon)
+  }
+}, false)