Javascript – http basic authentication “log out”

basic-authenticationhttpjavascriptlogout

HTTP basic authentication credentials are stored until the browser is closed, but is there a way to remove the credentials before the browser is closed?

I read about a trick with HTTP 401 status code, but it seems to work not properly (see comment to answer). Maybe the mechanism trac uses is the solution.

Can the credentials be deleted with JavaScript? Or with a combination of JavaScript and the status 401 trick?

Best Answer

Update: This solution does not seem to work anymore in many browsers. Kaitsu's comment:

This solution of sending false credentials to make browser forget the correct authenticated credentials doesn't work in Chrome (16) and IE (9). Works in Firefox (9).

Actually you can implement a workaround by sending false credentials to the service. This works in Browsers by sending another (non-existent?) Username without a password. The Browser loses the information about the authenticated credentials.

Example:

https://www.example.com/ => Log in with basic auth as "user1"

Now open

https://foobar@www.example.com/

You're Logged out. ;)

Regards

P.s.: But please test this with all needed Browsers before you rely on the given information.

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