customizing apache tomcat authentication Required popup

i want to add a "register" link into the apache authentication popup.

i would also like to change the error message page that is called when you press cancel. i looked into directory www/error where i found some开发者_JS百科 files but it seem none of those files is the error page that is called. how can i find the Authorization Required page that is called ? so i can change it.

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You can't - that's native browser behavior, not an Apache popup. Try different browsers and see how they do the popup differently.