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→Authentication
There are numerous ways how users can be authenticated in a web application (via OAuth, LDAP, …). The approach demonstrated on this page is pretty basic and straightforward:
* A login HTML page allows you to enter your credentials (user nameusername, password).
* A login check function checks if the typed in data matches one of the database users. If the input is valid, a session id will be set, and the user will be redirected to the main page. Otherwise, the redirection points back to the login page.
* A logout page deletes the session id.
