Authenticate user

:!: This request does not require to log in, as described in „Basics“

POST

/rest/auth

username=foo&password=bar

The parameter username equals the field username in the staff view, not the field name.

Invalid login information
FAIL
Valid
<?xml version="1.0" encoding="UTF-8"?>
<xml>
    <id>1</id>
    <staff_name>Foo Bar</staff_name>
    ...
</xml>