public. Authenticate a user.
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| Name | Value | Description |
| Ok | 200 | The request completed successfully |
| Unauthorized | 401 | Authentication failed |
Output:
<user name="{text}">
<email></email>
<groups>
<group name="default" />
</groups>
</user>The email address is always empty and the user is always part of the "default" group.
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