html - Authentication required? javascript -

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i wondering how can require authentication website. such in picture: https://kb.tanium.com/images/thumb/5/58/authenticationrequired.png/700px-authenticationrequired.png

can javascipt? help

that's basic http response code 401 sent browser upon request. can on webserver securing folder/page .htaccess file or directive, or can return 401 http response in code (java, php or whatever use) example in java: 

response.setstatus(httpservletresponse.sc_unauthorized);

normally handle of 401 responses job of browser, has nothing javascript. can try change defaut behavior of browser using javascript, try take @ page. i'd recommend not doing instead html form can freely customize , let return form identifiers.


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