examples: fix FRONTPAGE length off-by-one error

Author: yoursunny

examples/AsyncCam/handlers.cpp

@@ -149,8 +149,9 @@ rewriteFrontpage(const esp32cam::Settings& s, const String& var) {
 
 static void
 handleFrontpage(AsyncWebServerRequest* req) {
+  static const size_t contentLength = strlen(FRONTPAGE);
   auto settings = esp32cam::Camera.status();
-  req->send(200, "text/html", reinterpret_cast<const uint8_t*>(FRONTPAGE), sizeof(FRONTPAGE),
+  req->send(200, "text/html", reinterpret_cast<const uint8_t*>(FRONTPAGE), contentLength,
             [=](const String& var) { return rewriteFrontpage(settings, var); });
 }
 

examples/WifiCam/handlers.cpp

@@ -78,9 +78,10 @@ serveMjpeg() {
 void
 addRequestHandlers() {
   server.on("/", HTTP_GET, [] {
-    server.setContentLength(sizeof(FRONTPAGE));
+    static const size_t contentLength = strlen(FRONTPAGE);
+    server.setContentLength(contentLength);
     server.send(200, "text/html");
-    server.sendContent(FRONTPAGE, sizeof(FRONTPAGE));
+    server.sendContent(FRONTPAGE, contentLength);
   });
 
   server.on("/robots.txt", HTTP_GET,