https://www.speaklanguages.com/english/phrases/more-common-expressions So this website use SoundManager to play the audio. The required format to create sound is
Creates a sound with the specified ID and URL (simple two-parameter method.) Example:
soundManager.createSound('mySound','/audio/mysoundfile.mp3');
However, when I check the source code of the site, it's something like this
soundManager.createSound('en','im_going_out_f');
The actual sound URL is http://speaklanguages.cachefly.net/sound/en/mp3/im_going_out_f.mp3
So can someone please explain to me that how was that possible to include just the name of the file instead of the whole mp3 link?