Wordpress Rest API returns error

Question

I'am developing a plugin for wordpress and have trouble with the Rest API. On my test server it works without a problem. (v4.6.6) On a different server (v4.4.10) the API returns this error message:

{"code":"rest_invalid_handler","message":"
Der Handler f\u00fcr die Route ist ung\u00fcltig","data":{"status":500}}%

The message is in german and means "The handler for the route is invalid." Don't understand why they translate the error messages for an API. Makes no sense for me. :)

The routes on the http://domain/wp-json are equal. Maybe an problem with the different WP versions?

Definition of the route:

function __construct() {
    add_action( 'rest_api_init', function(){
        register_rest_route( 'test_namespace', 'ping', array(
            'methods' => 'POST',
            'callback' => array($this, 'ping_test'),
            'permission_callback' =>  array($this, 'myhacks_permission_callback'),
        ) );
    } );
}

Thanks for help.

Can you show us the rest of the file? I believe the issue is coming from $this scope is wrong. — Glen
– Glen, Commented Sep 3, 2017 at 13:16
I think the problem is related to the PHP version. I get this error on all Servers with < PHP 5.4. That is ok for me. I updated the PHP version and now it's working. — Schmidko
– Schmidko, Commented Sep 5, 2017 at 12:40
$this is fine, mine come from using 'callback' => array($this => 'ping_test') instead of 'callback' => array($this, 'ping_test') — Glen
– Glen, Commented Sep 6, 2017 at 13:18

Kresimir Plese · Accepted Answer · 2017-11-09 09:44:05Z

12

I had the same issue. It seems that method ping_test cannot be private. If you change it to public, the error disappears.

answered Nov 9, 2017 at 9:44

Kresimir Plese

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1 Comment

Marecky Over a year ago

This answer helped me with the same issue. I have AjaxController class registered in FrontController. In the AjaxController I register REST routes in its constructor with 'callback' => [$this,'portfolioSave',], args array property of register_rest_route. My method was protected and it helped me when I changed it to public. Thanks a lot!

Andrei · Accepted Answer · 2017-12-19 08:59:04Z

2

Take a look at the WordPress core and you can see that the method passed as the callback aka ping_test must be callable.

So this error triggers only when that method doesn't exist (for example I just encountered it because of a typo) or if is not accessible(like a protected or private method)

answered Dec 19, 2017 at 8:59

Andrei

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