#include "WiFi.h"

#include "ESPAsyncWebServer.h"

const char* ssid = "yourNetworkName";

const char* password =  "yourNetworkPass";

AsyncWebServer server(80);

void setup(){

  Serial.begin(115200);

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {

    delay(1000);

    Serial.println("Connecting to WiFi..");

  }

  Serial.println(WiFi.localIP());

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

    AsyncWebServerResponse *response = request->beginResponse(200, "text/plain", "Ok");

    response->addHeader("Test-Header", "My header value");

    request->send(response);

  });

  server.begin();

}

void loop(){}