I am trying to connect to my wordpress installation in order to create posts of a specific kind. The code I am using for that is:

$client = new IXR_Client('http://www.example.com/xmlrpc.php');

        $content = array(
            'title' => 'Test',
            'description' => 'content',
            'mt_allow_comments' => 0, // 1 to allow comments
            'mt_allow_pings' => 0, // 1 to allow trackbacks
            'post_type' => 'question',
            'mt_keywords' => 'test'

if (!$client->query('metaWeblog.newPost','', 'admin','pass', $content, publish)) {
    die('An error occurred - '.$client->getErrorCode().":".$client->getErrorMessage());
echo $client->getResponse();    //with Wordpress, will report the ID of the new post

When I try this code I get the following error:

An error occurred - 401:Invalid post type

I am positive question is a valid post type so I am not sure how to proceed from here.

Any help will be appreciated. Thanks

  • how is "question" registered? Oct 19, 2015 at 3:18
  • Hi, thanks. I am not entirely sure because it is part of a theme I bought. What I see is the following URL when I click on the menu example.com/wp-admin/edit.php?post_type=question I am trying to find the piece of code where 'question' is registered, but it might take me a while. Thanks for your time, and if you have any clues I will appreciate it!
    – JordanBel
    Oct 19, 2015 at 3:45

1 Answer 1


The wp.* methods that were added in WP 4.3 support custom post types. The old metaWeblog methods did not.

  • Thanks, I was looking at the same in the docs. I found some other answerds saying that it should work by setting 'post_type' to my type (other than post or page), but it looks it changed.
    – JordanBel
    Oct 19, 2015 at 4:02
  • 1
    You're looking at the old metaWeblog methods, the new wp.* methods support custom post types.
    – Milo
    Oct 19, 2015 at 4:35
  • I would like to post a side note: JSON API seems to be the future. Does new applications should be developed with it and old applications should move from XML-RPC to JSON API? In general, I think so.
    – cybmeta
    Oct 19, 2015 at 8:05

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