How to access a website with multiple virtual hots from Arduino Ethernet Shield. The problem is if you have used Arduino Ethernet Shield, then you know that you can connect a IP, But if the IP has multiple virtual hosts, it will only connect to default virtual host. If it is commercial shared VPS, You wont be able to make your site default.

Gist is use of HTTP protocol which allows you to define host in your request on virtual host server. Here are the possible headers.

http://en.wikipedia.org/wiki/List_of_HTTP_headers

You should also provide basic debugging info like “User-Agent” etc.

#include <SPI.h>
#include <Ethernet.h>

// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network:
byte mac[]            = {  0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
byte ip[]             = { 192, 168,   6,  30 };

byte server[]         = { ***, ***, 168,  16 }; // Your VPS

// Initialize the Ethernet client library
// with the IP address and port of the server
// that you want to connect to (port 80 is default for HTTP):
Client client(server, 80);

String response = "";

void setup() {
  Ethernet.begin(mac, ip);
  Serial.begin(9600);
  // Give the Ethernet shield a second to initialize
  delay(1000);
  Serial.println("Connecting...");
}

void loop() {
  if (!client.available() && client.connect()) {
    Serial.println("-- Connected");
    // Make a HTTP request:
    client.println("GET /bot HTTP/1.0");
    client.println("Host: example.com");
    client.println("User-Agent: Arduino/Shishir (mail.mastermind [at] gmail.com)");
    client.println();
  }
  if (client.available()) {
    char c = client.read();
    response.concat(c);
  }
  if(!client.connected()){
    process(response);
    //Serial.print(response);
  }
  if (!client.connected() && reset == 1) {
    Serial.println("disconnecting.");
    client.stop();
    response = "";
    delay(1000*10);
  }
}
void process(String response) {
  Serial.println(response);
}