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    - ``pub_key_dsa``
    - ``pub_key_rsa``
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    - ``pub_key_ed25519``
    - ``instance_id``
    - ``hostname``
    - ``fdqn``

Data is sent as ``x-www-form-urlencoded`` arguments.

**Example HTTP POST**:

.. code-block:: http

    POST / HTTP/1.1
    Content-Length: 1337
    User-Agent: Cloud-Init/21.4
    Accept-Encoding: gzip, deflate
    Accept: */*
    Content-Type: application/x-www-form-urlencoded

    pub_key_dsa=dsa_contents&pub_key_rsa=rsa_contents&pub_key_ecdsa=ecdsa_contents&pub_key_ed25519=ed25519_contents&instance_id=i-87018aed&hostname=myhost&fqdn=myhost.internal
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