Launching two servers sequentially on the same port

[cniedzi]

Hi,

I have two web servers:

AsyncWebServer server1(80);
AsyncWebServer server2(80);

I want to launch them sequentially, with some time interval, ex.:

start_server1();
delay (10000);
server1.end();

start_server2();

The issue is the first server launches as intended, but the second one is not accessible at default port (80). I guess the same port of 80 is a problem...

Is there any way to launch both servers as intended, using the same port?

Kind regards

[mathieucarbou]

Hello,
What is your use case exactly preventing you to only have one server instance ?
AsyncWebServer is built so that you do not have to deal with 2 especially on the same port.
Also, you are using more heap, more stack for no valid reason: the server is just a collection of handlers at the end.

[cniedzi]

Hello, What is your use case exactly preventing you to only have one server instance ?

Hi, I need to present different content on the root page (i.e. http://192.168.0.135/), depending on the context.

[mathieucarbou]

Hello, What is your use case exactly preventing you to only have one server instance ?

Hi, I need to present different content on the root page (i.e. http://192.168.0.135/), depending on the context.

You have some methods specially done for that which are called filters

[cniedzi]

So, will switching "/" and "/get" definitions on the fly work?

server.on("/", HTTP_GET, [](AsyncWebServerRequest *request){
      request->send_P(200, "text/html", playlists_config_index_html, processor_playlistsConfig);
    });

    server.on("/get", HTTP_GET, [] (AsyncWebServerRequest *request)

[mathieucarbou]

like this:

    server.on("/", HTTP_GET, [](AsyncWebServerRequest *request) {
      request->send(200, "text/plain", "Hello, world");
    }).setFilter([](AsyncWebServerRequest *request) {
      bool activated = ...
      return activated;
    });

[cniedzi]

You have some methods specially done for that which are called filters

I will look for them in the documentation then. thx.

[cniedzi]

@mathieucarbou
I've managed to make that one server handles all pages. I hope using global variable is admissible, like in the below example:

Server.on("/", HTTP_GET, [](AsyncWebServerRequest *request){
    request->send_P(200, "text/html", config_portal_index_html, processor_ConfigMenu);
  }).setFilter([](AsyncWebServerRequest *request) {
      bool activated;
      if (g_asyncServerPage == CONFIG_MENU) activated = true;
      else activated = false;
      return activated;
     });
  
  Server.on("/get", HTTP_GET, [] (AsyncWebServerRequest *request) { 
    if (request->hasParam("config")) {
      preferences.putBool("configportal", true);
      Server.end();
    }
    else if (request->hasParam("playlist")) {
      preferences.putBool("playlistportal", true);
      Server.end();
    }
    delay(10);
    ESP.restart();
  }).setFilter([](AsyncWebServerRequest *request) {
      bool activated;
      if (g_asyncServerPage == CONFIG_MENU) activated = true;
      else activated = false;
      return activated;
     });

The only issue I've faced is that the Async Server can't work at port 80 when started after exiting from WiFi Manager by Tzapu (probably it uses a kind of async web server at port 80). The workaround which works for me is to ESP.restart() after exit from WiFi Manager - I don't use it on regular basis in my device.

[mathieucarbou]

I don't know how this one works.
I've made MycilaESPConnect,.which also supports eth boards, AP mode, optional captive portal (can be used as a Network manager only) and is based on a provided espasyncwebserver library instance.