Returns response object with body in html format.
    :param body: Response data to be encoded.
    :param status: Response code.
    :param headers: Custom Headers.

def html(body, status=200, headers=None):
    '''
    Returns response object with body in html format.
    :param body: Response data to be encoded.
    :param status: Response code.
    :param headers: Custom Headers.
    '''
    return HTTPResponse(body, status=status, headers=headers,
                        content_type='text/html; charset=utf-8')