I want to easily send a number from a phone to my esp8266.
I have an app that sends the number in the format IP/number.
How can I modify the code to give my the number behind the IP address as an integer?
 

    #include <ESP8266WiFi.h>
    #include <WiFiClient.h>
    #include <ESP8266WebServer.h>
    #include <ESP8266mDNS.h>
    
    MDNSResponder mdns;
    
    // Replace with your network credentials
    const char* ssid = "YOUR_SSID";
    const char* password = "YOUR_PASSWORD";
    
    ESP8266WebServer server(80);
    
    String webPage = "";
    
    void setup(void){

      
      delay(1000);
      Serial.begin(115200);
      WiFi.begin(ssid, password);
      Serial.println("");
    
      // Wait for connection
      while (WiFi.status() != WL_CONNECTED) {
        delay(500);
        Serial.print(".");
      }
      Serial.println("");
      Serial.print("Connected to ");
      Serial.println(ssid);
      Serial.print("IP address: ");
      Serial.println(WiFi.localIP());
      
      if (mdns.begin("esp8266", WiFi.localIP())) {
        Serial.println("MDNS responder started");
      }
      
      server.on("/", [](){
        Serial.println("device connected");
      });
      server.begin();
      Serial.println("HTTP server started");
    }
     
    void loop(void){
      server.handleClient();
    } 

So it would do something like this for and should be looking through every i between 0 and 200. :

    server.on("/"+String(i), [](){
        Serial.println("i");
      });