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If the post url contains the string ``$INSTANCE_ID`` it will be replaced with
the id of the current instance. Either all data can be posted or a list of
keys to post. Available keys are:
- ``pub_key_dsa``
- ``pub_key_rsa``
- ``pub_key_ecdsa``
- ``pub_key_ed25519``
- ``instance_id``
- ``hostname``
- ``fdqn``
Data is sent as ``x-www-form-urlencoded`` arguments.
**Example HTTP POST**:
.. code-block:: http
POST / HTTP/1.1
Content-Length: 1337
User-Agent: Cloud-Init/21.4
Accept-Encoding: gzip, deflate
Accept: */*
Content-Type: application/x-www-form-urlencoded
pub_key_dsa=dsa_contents&pub_key_rsa=rsa_contents&pub_key_ecdsa=ecdsa_contents&pub_key_ed25519=ed25519_contents&instance_id=i-87018aed&hostname=myhost&fqdn=myhost.internal
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url: http://example.com/$INSTANCE_ID/
post: all
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post:
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- pub_key_rsa
- pub_key_ecdsa
- pub_key_ed25519
- instance_id
- hostname
- fqdn
tries: 5
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