ESP32 WebServer Library – version()

/*
 * Author: Avant Maker
 * Date: April 30, 2025
 * Version: 1.0
 * License: MIT 
 * 
 * Description: 
 * This example demonstrates how to use ESP32 WebServer Library's 
 * version() method to determine the HTTP protocol version specified
 * by the web client (like a browser or another application) in its
 * request to the ESP32 web server.
 *
 * Code Source:
 * This example code is sourced from the Comprehensive Guide
 * to the ESP32 Arduino Core Library, accessible on AvantMaker.com.
 * For additional code examples and in-depth documentation related to
 * the ESP32 Arduino Core Library, please visit:
 *
 * https://avantmaker.com/home/all-about-esp32-arduino-core-library/
 *
 * AvantMaker.com, your premier destination for all things
 * DIY, AI, IoT, Smart Home, and STEM projects. We are dedicated
 * to empowering makers, learners, and enthusiasts with
 * the resources they need to bring their innovative ideas to life.
 */
#include <WiFi.h>
#include <WebServer.h>

// Replace with your network credentials
const char* ssid = "your_SSID";          // Replace with your Wi-Fi SSID
const char* password = "your_PASSWORD";  // Replace with your Wi-Fi password

// Create WebServer object on port 80
WebServer server(80);

// Handler function for the root URL ("/")
void handleRoot() {
  // Get the HTTP version string from the request
  String httpVersion = server.version();

  // Print the version to the Serial Monitor
  Serial.print("Request received. Client HTTP Version: ");
  Serial.println(httpVersion);

  // Prepare the response message for the client
  String responseMessage = "AvantMaker Demo - Hello from ESP32!\n";
  responseMessage += "Your request used HTTP version: ";
  responseMessage += httpVersion;

  // Send the response
  server.send(200, "text/plain", responseMessage);
}

void handleNotFound() {
  String message = "File Not Found\n\n";
  message += "URI: ";
  message += server.uri();
  message += "\nMethod: ";
  message += (server.method() == HTTP_GET) ? "GET" : "POST";
  message += "\nArguments: ";
  message += server.args();
  message += "\n";
  for (uint8_t i = 0; i < server.args(); i++) {
    message += " " + server.argName(i) + ": " + server.arg(i) + "\n";
  }
  server.send(404, "text/plain", message);
}

void setup() {
  Serial.begin(115200);
  delay(100); // Wait for serial

  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("");
  Serial.println("WiFi connected.");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());

  // Set up the handler for the root path
  server.on("/", HTTP_GET, handleRoot);

  // Set up the handler for pages that are not found
  server.onNotFound(handleNotFound);

  // Start the server
  server.begin();
  Serial.println("HTTP server started. Open browser to http://" + WiFi.localIP().toString());
}

void loop() {
  // Listen for incoming client connections and handle them
  server.handleClient();
}