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/*  Simple Web Server for ESP8266-12E
 *  NattyFido 2015
 *  www.nattyfido.co.uk  (shameless plug!)
 */

#include <ESP8266WiFi.h>

const char* ssid = "ROBOT";                //  SSID of LAN/WLAN
const char* password = "ROBOT";        //  password
const int port = 80;                           //  port to serve pages through

const int led0 = 13;
const int led1 = 12;
const int led2 = 14;

int v1 = 0;
int v2 = 0;

WiFiServer server(port);

void setup() {
  Serial.begin(115200);                        //  start serial for debug
  delay(10);
  pinMode(led0, OUTPUT);                       //  all outputs for LEDs
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  digitalWrite(led0, 0);                       //  all LEDs off to start
  digitalWrite(led1, 0);
  digitalWrite(led2, 0);
  Serial.println();
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);                    //  connect to WiFi network
  while (WiFi.status() != WL_CONNECTED) {        //  wait until connected
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
  server.begin();                                // Start the server
  Serial.println("Server started");
  Serial.println(WiFi.localIP());                // Print the servers IP address
}

void loop() {
  WiFiClient client = server.available();        // Check if a client has connected
  if (!client) {
    return;
  }
  Serial.println("New client");                  // Wait until the client sends some data
  while (!client.available()) {
    delay(1);
  }
  String req = client.readStringUntil('\r');     // Read the first line of the request
  Serial.println(req);
  client.flush();
  if (req.indexOf("/led1/0") != -1)             //  if req = /led1/0
    v1 = 0;                                      //  set flag to turn LED1 off
  else if (req.indexOf("/led1/1") != -1)         //  if req = /led1/1
    v1 = 1;                                      //  set flag to turn LED1 on
  else if (req.indexOf("/led2/0") != -1)         //  if req = /led2/0
    v2 = 0;                                      //  set flag to turn LED2 off
  else if (req.indexOf("/led2/1") != -1)         //  if req = /led2/1
    v2 = 1;                                      //  set flag to turn LED2 on
  else {
    Serial.println("Invalid request");           //  URL not recognised
    String r = HTMLHeader();                     //  display home page
    r += HTMLPage();
    r += HTMLFooter();
    client.print(r);                              //  send page to clients browser
    client.stop();                                //  disconnect client
    return;
  }
  digitalWrite(led1, v1);                         //  set LED1 according to v1
  digitalWrite(led2, v2);                         //  set LED2 according to v2
  client.flush();
  String s = HTMLHeader();                        //  display page
  s += HTMLPage();
  s += HTMLFooter();
  digitalWrite(led0, 1);                          //  page is being sent
  client.print(s);                                //  send the response to the client
  client.stop();                                  //  disconnect client
  digitalWrite(led0, 0);                          //  finished sending page
  delay(1);
  Serial.println("Client disonnected");
  Serial.println("");
}

String HTMLHeader() {                             //  standard HTML header
  String h = "HTTP/1.1 200 OK\r\n";
  h += "Content-Type: text/html\r\n\r\n";
  h += "<!DOCTYPE HTML>\n";
  h += "<html>\n";
  h += "<body>\n";
  return h;
}
String HTMLFooter() {                            //  standard HTML footer
  String f = "<table width=\"100%\" bgcolor=\"black\" cellpadding=\"12\" border=\"0\">\n";
  f += "<tr><td><p style = \"color: white; background: black;font-size: 0.8em;";
  f += "font-weight: bold; text-align: center; margin: 0px 10px 0px 10px;\">\n";
  f += "<a href = \"http://www.nattyfido.co.uk\">Dean Fowler</a> &copy; 2015</p></td></tr>";
  f += "</table>";
  f += "</body>\n";
  f += "</html>\n";
  return f;
}

String HTMLPage() {                        //   main HTML for page, edit to suit your application
  String p = "<h1>Simple Webserver</h1>\n";
  p += "<p>Running on a <b>ESP8266-12E</b></p>\n";
  p += "<p>Code written in <b>Arduino IDE</b> by <i>NattyFido</i></p>\n";
  //  display links depending on current state of LEDs 1 & 2
  p += (v1) ? "<p><a href = \"/led1/0\">Turn LED 1 off</a></p>\n" : "<p><a href = \"/led1/1\">Turn LED 1 on</a></p>\n";
  p += (v2) ? "<p><a href = \"/led2/0\">Turn LED 2 off</a></p>\n" : "<p><a href = \"/led2/1\">Turn LED 2 on</a></p>\n";
  return p;
}
- See more at: http://www.esp8266.com/viewtopic.php?f=29&t=6141#sthash.eAoiRVB1.dpuf