Jquery ajax request progress bar lengthComputable false

Jquery ajax request progress bar lengthComputable false

Hello everyone,

I am trying to make an ajax request to load html content from a really simple html file. Don't know what I am doing wrong but the progress isn't working, it loads up the content but no progress. It always displays lengthComputable false, but trying to research about couldnt find how to solve my issue.

I spoted my issue on a different forum but no help yet. Hope someone here can give me a hand.