Updated HelloServer with mDNS and NotFound catcher with custom page

the not found handler should be used in conjunction with other means of
getting data, like SD card

libraries/ESP8266WebServer/examples/HelloServer/HelloServer.ino

@@ -1,29 +1,36 @@
 #include <ESP8266WiFi.h>
 #include <WiFiClient.h>
 #include <ESP8266WebServer.h>
+#include <ESP8266mDNS.h>
  
-const char* ssid = "...............";
-const char* password = "...............";
-
+const char* ssid = "........";
+const char* password = "........";
+MDNSResponder mdns;
 
 ESP8266WebServer server(80);
 
-const int led = 13;
- 
 void handle_root() {
-  digitalWrite(led, 1);
   server.send(200, "text/plain", "hello from esp8266!");
-  delay(100);
-  digitalWrite(led, 0);
 }
 
-void setup(void)
-{
-  Serial.begin(115200);
-  pinMode(led, OUTPUT);
-  digitalWrite(led, 0);
+bool handle_not_found(){
+  String 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";
+  }
+  message += "\nNotFound!";
+  server.send(404, "text/plain", message);
+  return true;
+}
  
-  // Connect to WiFi network
+void setup(void){
+  Serial.begin(115200);
   WiFi.begin(ssid, password);
   Serial.println("");
 
@@ -38,17 +45,21 @@ void setup(void)
   Serial.print("IP address: ");
   Serial.println(WiFi.localIP());
   
+  if (mdns.begin("esp8266", WiFi.localIP())) Serial.println("MDNS responder started");
+  
   server.on("/", handle_root);
   
   server.on("/inline", [](){
     server.send(200, "text/plain", "this works as well");
   });
 
+  server.onNotFound(handle_not_found);
+  
   server.begin();
   Serial.println("HTTP server started");
 }
  
-void loop(void)
-{
+void loop(void){
+  mdns.update();
   server.handleClient();
 }