username and password with webgate in Android Studio

I'm here because i'm having some trouble with Webgate in Android Studio.

First of all, i'm an Electric Engineer so please, take it ease on me.

I'm using a software called PowerStudio from Circutor for creating a Scada, this software comes with a server that i can connect via internet after creating a host in no ip, and works perfectly.

So i tried to created an application that opens the web in full screen and i did, but with one problem.

when i enter the web via my explorer, the first thing that the web does, is to prompt a login screen, and if a press the cancel button, the web presents this message "Unauthorized access", and that's good, but, when i enter directly by the webgate, the web doesn't prompt the login screen and present the message "Unauthorized access", immediately, and i do not know why.

The web server is based on HTML5. I appreciate anyone who can help me.