def METHOD_NAME(self, http_request):
    if http_request.method == 'POST':
        return ''
    qs_parts = []
    for param in sorted(http_request.params):
        value = boto.utils.get_utf8_value(http_request.params[param])
        param_ = quote(param, safe='-_.~')
        value_ = quote(value, safe='-_.~')
        qs_parts.append('{0}={1}'.format(param_, value_))
    return '&'.join(qs_parts)