HTTP Stream PHP出错

I have this method:

protected function _sendRequest($url, $method, Busca_Cxense_Data $data, $get = null) {
    if (! isset ( $this->_urls [$url] )) {
        throw new Busca_Cxense_Exception_Argument ( "El tipo de url enviado no es valido. (type: {$url})" );
    }
    $url = $this->_urls [$url] . $data->getUrlKey () . ($get ? "$get" : '');
    $httpConfig = array ('http' => array ('method' => $method, 'request_fulluri' => $url, 'ignore_errors' => false ) );
    if ($data->getSendJson ()) {
        $json = $this->_setJson ( $data );
        $header = "Content-Type: application/json
Content-Length: " . strlen ( $json );
        $httpConfig ['http'] ['content'] = $json;
    } else {
        $header = "Content-Type: text/html";
    }
    $httpConfig ['http'] ['header'] = $header;
    $context = stream_context_create ( $httpConfig );
    $stream = fopen ($url, 'r', false, $context);
    $result = stream_get_contents($stream);
    $headers = stream_get_meta_data($stream);
    fclose($stream);
    if (! $result) {
        print_r ( $data );
        var_dump ( $url );
        print_r ( $httpConfig );
        throw new Busca_Cxense_Exception_MethodCall ( "Bad call. 
String: $json
" );
    }
    var_dump($result); exit;
    return array ('json' => json_decode ( $result ), 'string' => $result, 'headers' => $headers );
}

As you can see, it create a context and open an stream. However, I have a error very strange. If I send this url:

http://sandbox.cxsearch.cxense.com/api/search/levelup?p_aq=query%28category^1:%22preview%20trailer%22,token-op=or%29&p_sm=idobject:desc&p_s=0&p_c=20&p_dr=title

it throws a bad request error, but if I send this other one:

http://sandbox.cxsearch.cxense.com/api/search/levelup?p_q=test&p_sm=idobject:desc&p_s=0&p_c=20&p_dr=title

it works as expected. Do I have to encode the url or something?

FIXED I was able to figure what the problem was. I Only need to change the space for %20. And that was all...

I was able to figure what the problem was. I Only need to change the space for %20. And that was all...

400 response is returned by remote server, so you want to see specs/contact people on that side on how to build correct query. The urls you provide look very different and remote system might have own validation rules on values, list of provided parameters, etc. Also it might require some specific headers and/or request body.