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Because the BA field has to be sent in the header of each HTTP request, the web browser needs to [[Cache (computing)|cache]] credentials for a reasonable period of time to avoid constantly prompting the user for their username and password. Caching policy differs between browsers.
HTTP does not provide a method for a web server to instruct the client to "log out" the user. However, there are a number of methods to clear cached credentials in certain web browsers. One of them is redirecting the user to a URL on the same ___domain, using credentials that are intentionally incorrect. However, this behavior is inconsistent between various browsers and browser versions.<ref name=":0">{{cite web | url=https://stackoverflow.com/questions/31326/is-there-a-browser-equivalent-to-ies-clearauthenticationcache | title=Is there a browser equivalent to IE's ClearAuthenticationCache? | publisher=StackOverflow | access-date=March 15, 2013}}</ref>{{Better source needed|reason=The current source is user-generated and is insufficiently reliable ([[WP:NOTRS]]).|date=March 2025}} [[Internet Explorer|Microsoft Internet Explorer]] offers a dedicated JavaScript method to clear cached credentials:<ref>{{cite web | url=https://docs.microsoft.com/en-us/previous-versions/windows/internet-explorer/ie-developer/platform-apis/hh801226(v=vs.85)#idmclearauthenticationcache | title=<code>IDM_CLEARAUTHENTICATIONCACHE</code> command identifier | publisher=Microsoft | access-date=March 15, 2013}}</ref>
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