Control Wemos D1 mini with Relay Shield from web page

#include <ESP8266WiFi.h>

// Turn ON Wemos D1 R2 Relay shield and LED using http://192.168.0.160/LED=ON
// Turn OFF Wemos D1 R2 Relay shield and LED using http://192.168.0.160/LED=OFF
// Or use buttons on the web page from the IP address used
// See below regarding not using static IP

const char* ssid = "SSID";
const char* password = "password";

const int ledPin = 2; // GPIO2
const int relayPin = D1;

// Remove/comment these three and the WiFi.begin row if static IP address is not used
IPAddress ip(192, 168, 0, 160);
IPAddress gateway(192, 168, 0, 1);
IPAddress subnet(255, 255, 255, 0);

WiFiServer server(80);

void setup() {
  Serial.begin(115200);
  delay(10);

  pinMode(ledPin, OUTPUT);
  pinMode(relayPin, OUTPUT);

  digitalWrite(ledPin, HIGH);   // turn off LED with voltage HIGH
  digitalWrite(relayPin, LOW);  // turn off relay with voltage LOW

  // Connect to WiFi network
  Serial.println();
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.config(ip, gateway, subnet); // Remove/comment if static IP is not used

  WiFi.begin(ssid, password);

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

  // Start the server
  server.begin();
  Serial.println("Server started");

  // Print the IP address
  Serial.print("Use this URL to connect: ");
  Serial.print("http://");
  Serial.print(WiFi.localIP());
  Serial.println("/");

}

void loop() {
  // Check if a client has connected
  WiFiClient client = server.available();
  if (!client) {
    return;
  }

  // Wait until the client sends some data
  Serial.println("new client");
  while(!client.available()){
    delay(1);
  }

  // Read the first line of the request
  String request = client.readStringUntil('\r');
  Serial.println(request);
  client.flush();

  // Match the request

  int value = HIGH;
  if (request.indexOf("/LED=ON") != -1)  {
    digitalWrite(ledPin, LOW);    // turn on LED with voltage LOW
    digitalWrite(relayPin, HIGH); // turn on relay with voltage HIGH
    value = LOW;
  }
  if (request.indexOf("/LED=OFF") != -1)  {
    digitalWrite(ledPin, HIGH);   // turn off LED with voltage HIGH
    digitalWrite(relayPin, LOW);  // turn off relay with voltage LOW
    value = HIGH;
  }

  // Return the response
  client.println("HTTP/1.1 200 OK");
  client.println("Content-Type: text/html");
  client.println(""); //  do not forget this one
  client.println("<!DOCTYPE HTML>");
  client.println("<html>");

  client.print("Led/relay pin is now: ");

  if(value == LOW) {
    client.print("On");
  } else {
    client.print("Off");
  }
  client.println("<br><br>");
  client.println("<a href=\"/LED=ON\"\"><button>Turn On </button></a>");
  client.println("<a href=\"/LED=OFF\"\"><button>Turn Off </button></a><br />");
  client.println("</html>");

  delay(1);
  Serial.println("Client disonnected");
  Serial.println("");
}