tsjippy

path is ok than, probably your access token is incorrect?
http://99rabbits.com/get-dropbox-access-token/

did you have the same problem with the original plugin?

All of the sudden its working

Now have the same headers:

<form action="https://www.tastedelft.nl/wp-admin/admin-post.php?action=add_foobar" method="post" class="wpcf7-form" novalidate="novalidate">

My custom form does a redirect, the Contact form 7 does not.

my whole custom, working form:

<form action="https://www.tastedelft.nl/wp-admin/admin-post.php?action=add_foobar" method="post" class="wpcf7-form" novalidate="novalidate">
   <input name="name" placeholder="Enter email" type="text">
   <button type="submit" class="btn btn-primary">Submit</button>
</form>

I tried something totally different to achieve the same result but that fails as well:

codex

So I have added <input type="hidden" name="action" value="add_foobar">to the form, and this to my functions.php:

function prefix_admin_add_foobar(){ 
    status_header(200);
    var_dump($_POST);
    // wp_redirect( 'http://any.url/',302 ); 
    die("Server received '{$_POST['name']}' from your browser.");

}

add_action( 'admin_post_add_foobar', 'prefix_admin_add_foobar' );
add_action( 'admin_post_nopriv_add_foobar', 'prefix_admin_add_foobar' ); // this is for non logged users

does not work…

Ah thanks