Exceptions Code not running properly!

<?php

ini_set('display_errors', 1);

include "./vendor/autoload.php";

//Make some custom exceptions
class HttpRedirectException extends Exception {}
class HttpClientException extends Exception {}
class HttpServerException extends Exception {}


function fetchHttpBody($url)
{
  $browser = new Buzz\Browser();
  $response = $browser->get($url);

  $content = $response->getContent();
  $statusCode = $response->getStatusCode();

  $statusGroup = substr((string) $statusCode, 0, 1);

  switch ($statusGroup) {
    case '2':
    return $content;
    case '3':
    throw new HttpRedirectException('HTTP request was redirected', $statusCode);
    case '4':
    throw new HttpClientException('You made a bad request', $statusCode);
    case '5':
    throw new HttpServerException('The server you tried calling is not ok', $statusCode);
    default:
    throw new Exception('Got an unexpected status code of '.$statusGroup);
  }
}

//Now try this request
try {
  echo fetchHttpBody('http ://example.org/');

  } catch (HttpRedirectException $e) {
  printf('Redirect Error: %s (code %d)', $e->getMessage(), $e->getCode());

} catch (HttpClientException $e) {
  printf('Client Error: %s (code %d)', $e->getMessage(), $e->getCode());

  } catch (HttpServerException $e) {
  printf('Server Error: %s (code %d)', $e->getMessage(), $e->getCode());

  } catch (Exception $e) {
  echo "General Error: ".$e->getMessage();
}