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srujith chintha 4srujith chintha 4 

callout class

public class CalloutClass { @future(callout=true) public static void makeCallout() { HttpRequest request = new HttpRequest(); // Set the endpoint URL. String endpoint = 'http://yourHost/yourService'; request.setEndPoint(endpoint); // Set the HTTP verb to GET. request.setMethod('GET'); // Send the HTTP request and get the response. HttpResponse response = new HTTP().send(request); } }

1.how to make callout by adding trigger
AbhinavAbhinav (Salesforce Developers) 
Check this: