Hi there,
I'm using nginx auth_basic "Restricted area" to protect website. So users have to enter user/pass one time to access, it work fine in computer. However, When testing with Ipad, everytime access to particular page which page extension is .ivp, it will require a credential, once I submit user/password, I can continue to work in this website. I think my issue similar to https://stackoverflow.com/questions/6178507/mp4-in-safari-fails-with-htaccess-authentication, but I did not using .htaccess to try with the solution mentioned in this topic.

As you can see in access log https://pastebin.com/6vWhtb3Y, when I submited a POST request, then browser will have GET request to ivp page, and got a 401 code which is require to enter user/password. Any idea of what might be causing this?
Thanks.