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Ĕšlăɱ Ĕlăššăl
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hello , i hava a question please , i make simple project for controlling led with arduino mega and ethernet shield but not working , when i open browser and i ask ethernet shield server ip address , it fail and give me error page , what’s wrong in my code please

/*
Web Server
A simple web server
Circuit:

  • Ethernet shield attached to pins 10, 11, 12, 13
    */
    //-------------------------------------------------------------------------------------------------------
    #include <SPI.h>
    #include <Ethernet.h>

// Enter a MAC address and IP address for your controller below.
byte mac[] = {0x90, 0xA2, 0xDA, 0x0D, 0x48, 0xD3 };

// The IP address will be dependent on your local network:
// assign an IP address for the controller:

IPAddress ip(192,168,1,177);
IPAddress gateway(192,168,1,1);
IPAddress subnet(255, 255, 255, 0);

// Initialize the Ethernet server library with the port you want to use.
EthernetServer server(80);
String readString;
//-------------------------------------------------------------------------------------------------------
//-------------------------------------------------
// Any extra codes for Declaration :

// Declare Pin 8 as an LED because thats what we will be connecting the LED to.You could use any other pin and would then have to change the pin number.
int led = 8;

//-------------------------------------------------
//-------------------------------------------------------------------------------------------------------
void setup()
{
//-------------------------------------------------

// Extra Set up code:
pinMode(led, OUTPUT); //pin selected to control

//-------------------------------------------------
//-------------------------------------------------------------------------------------------------------
//enable serial data print
Serial.begin(9600);

//start Ethernet
Ethernet.begin(mac, ip, gateway, subnet);
server.begin();
Serial.print("Server is at ");
Serial.println(Ethernet.localIP());
Serial.println(“LED Controller Test 1.0”);
}
//-------------------------------------------------------------------------------------------------------
//-------------------------------------------------------------------------------------------------------

void loop()
{
// listen for incoming clients
EthernetClient client = server.available();
if (client)

{
Serial.println(“new client”);

while (client.connected())
{
  if (client.available())

  {
    char c = client.read();

    //read char by char HTTP request
    if (readString.length() < 100)

    {

      //store characters to string
      readString += c;
      //Serial.print(c);


      Serial.write(c);
      // if you've gotten to the end of the line (received a newline
      // character) and the line is blank, the http request has ended,
      // so you can send a reply
      //if HTTP request has ended
      if (c == '\n') {
        Serial.println(readString); //print to serial monitor for debuging

//--------------------------------------------------------------------------------------------------------
// Needed to Display Site:
client.println(“HTTP/1.1 200 OK”); //send new page
client.println(“Content-Type: text/html”);
client.println();
client.println("<HTML>");
client.println("<HEAD>");

//--------------------------------------------------------------------------------------------------------
//-------------------------------------------------

// what is being Displayed :

        client.println("<TITLE>Home Automation</TITLE>");
         client.println("<center>");
        client.println("</HEAD>");
        client.println("<BODY>");
        client.println("<H1>Home Automation</H1>");
        client.println("<hr />");
        client.println("<center>");

        client.println("<a href=\"/?lighton\"\">Turn On Light</a>");
        client.println("<br />");
        client.println("<br />");
        client.println("<a href=\"/?lightoff\"\">Turn Off Light</a><br />");     

        client.println("</BODY>");
        client.println("</HTML>");

        delay(1);
        //stopping client
        client.stop();

        //-------------------------------------------------
        // Code which needs to be Implemented:
        if(readString.indexOf("?lighton") >0)//checks for on
        {
          digitalWrite(8, HIGH);    // set pin 8 high
          Serial.println("Led On");
        }
        else{
          if(readString.indexOf("?lightoff") >0)//checks for off
          {
            digitalWrite(8, LOW);    // set pin 8 low
            Serial.println("Led Off");
          }
        }
        //clearing string for next read
        readString="";

        // give the web browser time to receive the data
        delay(1);
        // close the connection:
        client.stop();
        Serial.println("client disonnected");

      }
    }
  }
}

}
}

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