From d2215097a780deb668e6ccce4edab3e6bd95afbe Mon Sep 17 00:00:00 2001
From: drjones <drjones@MBook-Air.local>
Date: Fri, 3 Apr 2026 05:47:57 -0700
Subject: [PATCH] Fix web UI hang: use send_P for 15 KB HTML response
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The setContentLength + send(200,type,"") + sendContent() three-step
pattern was unreliable — WebServer::send() with an empty String body
can mark the response complete internally, causing sendContent() to
be silently dropped. send_P() handles Content-Length, header prep,
and chunked body delivery from const flash data in a single call
with zero heap allocation.

Made-with: Cursor
---
 src/main.cpp | 12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)

diff --git a/src/main.cpp b/src/main.cpp
index 96945f9..751094a 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -2240,17 +2240,7 @@ window.addEventListener('resize',capDrawWave);
 )HTML";
 
 static void handleRoot() {
-  // ETag based on compile timestamp — browser caches until next flash
-  server.sendHeader("ETag", "\"" __DATE__ __TIME__ "\"");
-  server.sendHeader("Cache-Control", "no-cache");  // revalidate via ETag, don't re-download
-  if (server.hasHeader("If-None-Match") &&
-      server.header("If-None-Match") == "\"" __DATE__ __TIME__ "\"") {
-    server.send(304);  // Not Modified — browser uses cached copy, saves ~15 KB
-    return;
-  }
-  server.setContentLength(sizeof(kHtml) - 1);
-  server.send(200, "text/html; charset=utf-8", "");
-  server.sendContent(kHtml, sizeof(kHtml) - 1);
+  server.send_P(200, "text/html; charset=utf-8", kHtml, sizeof(kHtml) - 1);
 }
 
 static void handleLog() {