i'm playing with the REST api and when doing some REST requests I got sometimes what I want, and sometimes this response generated by rest_ensure_response() :

    "code": "rest_no_route",
    "data": {
        "status": 404
    "message": "No route was found matching the URL and request method"

...But how do you deal with that response, since it is returned as a simple JSON object (or array). It is not a WP_Error object that I could check.

Here's how I do actually :

function api_request($url){

    $request = wp_remote_get($url);
    if (is_wp_error($request)) return $request;

    $response = wp_remote_retrieve_body( $request );
    if (is_wp_error($response)) return $response;

    $response = json_decode($response, true);

    //handle errors ?
    if ( $code = wpsstm_get_array_value('code',$response) ){
        $message = wpsstm_get_array_value('message',$response);
        $data = wpsstm_get_array_value('data',$response);
        $error = new WP_Error($code,$message,$data );

        $this->debug_log($error,'query API error');

        return $error;

    return $response;


Thanks !

  • Well, what's your code for making the API request? And what exactly do you mean by, "handle"?
    – Sally CJ
    Commented Mar 21, 2019 at 2:12
  • @SallyCJ : I just edited te question
    – gordie
    Commented Mar 21, 2019 at 6:28
  • I think you are already dealing properly with the response/error - when the response body is a JSON object with a code, message and data.status other than 400, you can assume the REST API returned a WP_Error but of course as a string.
    – Sally CJ
    Commented Mar 21, 2019 at 22:40
  • @SallyCJ, yes, that is it. So I can rely on code + message + data.status ?
    – gordie
    Commented Mar 22, 2019 at 8:45
  • Yes, you can, if the REST API endpoint uses rest_ensure_response() to return the response. So you could do something like if ( response.data && response.data.status >= 400 ) to check if it's an error. Btw, sorry about the "other than 400" in my previous comment... I actually meant to say, "equals to or greater than 400".
    – Sally CJ
    Commented Mar 23, 2019 at 6:10

1 Answer 1


I dug in the codex and found some interesting functions. This is how I finally did it :

function api_request($api_url = null, $params=null,$method = 'GET'){

    if (!$api_url){
        return new WP_Error('no_api_url',"Missing API URL");

    //Create request
    $request = WP_REST_Request::from_url( $api_url );

    $request->set_method( $method );

        case 'GET':
        case 'POST':

    //Get response
    $response = rest_do_request( $request );

    if ( $response->is_error() ) {
        return $response->as_error();

    //Get datas
    $datas = $response->get_data();

    return $datas;


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