Android: Adding header info when fetching or sending data to server-side script

With reference to previous video on fetching and posting data from/to the web.
Example: 
conn.setDoOutput(true); // POST
// prepare headers
conn.setRequestProperty("X-Parse-Application-Id", /*** your parse app id in parse.com ***/);
conn.setRequestProperty("X-Parse-REST-API-Key", /*** your parse REST API key in parse.com ***/);
conn.setRequestProperty("Content-Type", "application/json");