Sample Code:
try {
HTTP h = new HTTP();
HTTPRequest req = new HTTPRequest();
req.setEndPoint( 'https://api.github.com/users/hadley/orgs' );
req.setTimeOut( 1 );
req.setMethod( 'GET');
HTTPResponse res = h.send( req );
}
catch ( System.CalloutException ex ) {
System.debug( 'Error Message is ' + ex.getmessage() );
system.debug( 'Line Number is ' + ex.getLineNumber() );
system.debug( 'Stace Trace String is ' + ex.getStackTraceString() );
}
Output: