Don’t write your own bootstrapper, use Ajax hooks via wp-admin/admin-ajax.php
Documentation: https://codex.wordpress.org/AJAX_in_Plugins
Then you can be sure WordPress has included all the functions you need.
Update:
I missed the bit about posting from local machine to remote server. If your JavaScript is running on another domain, it won’t be sending back your web server’s login cookies. CORS cannot help you with that.
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