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A requests auth instance that can be reused across requests. This signer is intended to be used
when signing requests for a given user and it requires that user's ID, their private key
and cerificate fingerprint.
The private key can be sourced from a file (private_key_file_location) or the PEM string can be
provided directly (private_key_content).
The headers to be signed by this signer are not customizable.
You can manually sign calls by creating an instance of the signer, and
providing it as the ``auth`` argument to Requests functions:
.. code-block:: python
import requests
from oci import Signer
auth = Signer(...)
resp = requests.get("https://...", auth=auth)
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