[server changed]Unity Asset Bundle not downloading in Android

Hi Everyone,

I am working on the asset bundle concept now, i have exported my asset unity and uploaded it on my server.
Once uploaded completed i got the link from my server and test it on my system it was downloaded.
Then i have exported my application to android and tested there it didn't download my asset from the server.

Before it was happen when i use open source server, and now i test it on Amazon server my office one, but it didn't happen now.

I have no idea why this issue coming, i have tried with my old asset also but its not happening.

Please help me how to solve this issue.

Please find the project here:
https://www.dropbox.com/s/lb8jzt4p6srsq6q/AssetbundleProject.unitypackage?dl=0