Graph API – developers.facebook.com

Simple Batched Requests. The Batch API takes in an JSON object that is an array of your HTTP requests. Each of your requests has a method (corresponding to HTTP method GET/PUT/POST/DELETE etc.), a relative url (the portion of the URL after graph.facebook.com), optional headers array (corresponding to HTTP headers) and an optional body (for POST and PUT requests).

https://developers.facebook.com/docs/graph-api/making-multiple-requests/