All classes that implement HttpException

class \Guzzle\Http\Exception\BadResponseException
class \Guzzle\Http\Exception\ClientErrorResponseException
class \Guzzle\Http\Exception\CouldNotRewindStreamException implements HttpException
class \Guzzle\Http\Exception\CurlException
class \Guzzle\Http\Exception\RequestException implements HttpException
class \Guzzle\Http\Exception\ServerErrorResponseException
class \Guzzle\Http\Exception\TooManyRedirectsException