I work with the API, located in my same site. Backend requires each request header encrypted login / password system Basic HTTP Authentication - Basic access authentication
If the data entry entered incorrectly - takes off here is a warning:

Rough translation
Authentication required, to access the server http://gkeep.ua:80 you've to provide your credentials. Server message: Secured Area
it is the same type as a normal alert (), prompt () and confirm ()
I would like to disable this window by overriding function
window.alert = function () {}; alert (12345); // does not work
but it appeared that it is not alert (), audio prompt () or confirm ()
it is generally different, and how to turn it off, I do not understand
can someone faced with such a task, I will be grateful if you tell me how to solve it
 
     
     
     
    