How to send very large html pages?

[tobiasfaust]

Hi, currently i´m using beginResponseStream to send my webpages to webserver. Its works fine. But if the webpage is over a certain size, the ESP32 (Wroom) crashes.

My code look like this:

 void Func(AsyncWebServerRequest *request) {
  AsyncResponseStream *response = request->beginResponseStream("text/html");
  response->addHeader("Server","ESP Async Web Server");
  
  [...]
  response->println("");
  response->println("  IP-Adresse:");
  response->printf ("  %s\n", WiFi.localIP().toString().c_str());
  response->println("");
  [...]
  
  request->send(response);
}

To solve this RAM overflow problem I tried to understand the "beginChunkedResponse" example https://github.com/me-no-dev/ESPAsyncWebServer#chunked-response But i dont know, how i can apply this example on my code. The webpage is too big so i cannot push it into a string variable which the example needs.

Any suggestions?

Before, i used the standard Sync ESP8266Webserver. Its allowed me to send chunks by demand

  void Func::handleRoot() {
  String html;
  server->sendHeader("Cache-Control", "no-cache, no-store, must-revalidate");
  server->sendHeader("Pragma", "no-cache");
  server->sendHeader("Expires", "-1");
  server->setContentLength(CONTENT_LENGTH_UNKNOWN);
  server->send(200, "text/html", "");

  [...]
  html.concat("\n");
  html.concat("IP-Adresse:\n");
  sprintf(buffer, "%s\n", WiFi.localIP().toString().c_str());
  html.concat(buffer);
  html.concat("\n");  

  server->sendContent(html.c_str()); html = "";

  html.concat("\n");
  [...]

  server->send(200, "text/html", html.c_str());   // Send HTTP status 200 (Ok) and send some text to the browser/client
}


By using server->sendContent(html.c_str());  i´m able to send the buffer out and fill it again,
@me-no-dev  -> Its possible to add the feature in your AsyncWebserver too?