{serverType: "ErasureSD", signer: signerV4},
		// Init and run test on ErasureSD backend with signature v2.
		{serverType: "ErasureSD", signer: signerV2},
		// Init and run test on ErasureSD backend, with tls enabled.
		{serverType: "ErasureSD", signer: signerV4, secure: true},
		// Init and run test on Erasure backend.
		{serverType: "Erasure", signer: signerV4},
		// Init and run test on ErasureSet backend.

  // If this value is nil, the default grace period will be used instead.
  // The grace period is the duration in seconds after the processes running in the carp are sent
  // a termination signal and the time when the processes are forcibly halted with a kill signal.
  // Set this value longer than the expected cleanup time for your process.
  // Defaults to 30 seconds.
  // +optional
  optional int64 terminationGracePeriodSeconds = 4;

// The s3ChunkedReader returns io.EOF when the final 0-length chunk is read.
func newUnsignedV4ChunkedReader(req *http.Request, trailer bool) (io.ReadCloser, APIErrorCode) {
	if trailer {
		// Discard anything unsigned.
		req.Trailer = make(http.Header)
		trailers := req.Header.Values(awsTrailerHeader)
		for _, key := range trailers {
			req.Trailer.Add(key, "")
		}
	} else {
		req.Trailer = nil
	}

// It can be optionally associated with a particular assigner, in which case it
// contains one valid set of trust anchors for that signer. Signers may have
// multiple associated ClusterTrustBundles; each is an independent set of trust
// anchors for that signer. Admission control is used to enforce that only users
// with permissions on the signer can create or modify the corresponding bundle.
message ClusterTrustBundle {
  // metadata contains the object metadata.

  // indicating the request was approved and should be issued by the signer.
  //
  // A "Denied" condition is added via the /approval subresource,
  // indicating the request was denied and should not be issued by the signer.
  //
  // A "Failed" condition is added via the /status subresource,
  // indicating the signer failed to issue the certificate.
  //
  // Approved and Denied conditions are mutually exclusive.

- Addressed an issue where a JWT authenticator set up via `--authentication-config` would encounter failures in verifying tokens not signed with RS256. ([#123282](https://github.com/kubernetes/kubernetes/pull/123282), [@enj](https://github.com/enj))

	}

	if err = claims.UnmarshalJSON(buf[:n]); err != nil {
		return nil, &jwtgo.ValidationError{Inner: err, Errors: jwtgo.ValidationErrorMalformed}
	}

	for _, signer := range hmacSigners {
		if string(alg) == signer.Name {
			return signer, nil
		}
	}

	return nil, jwtgo.NewValidationError(fmt.Sprintf("signing method (%s) is unavailable.", string(alg)),
		jwtgo.ValidationErrorUnverifiable)
}

		{serverType: "ErasureSD", signer: signerV4},
		// Init and run test on ErasureSD backend, with tls enabled.
		{serverType: "ErasureSD", signer: signerV4, secure: true},
		// Init and run test on Erasure backend.
		{serverType: "Erasure", signer: signerV4},
		// Init and run test on ErasureSet backend.
		{serverType: "ErasureSet", signer: signerV4},
	}
	testCases := []*TestSuiteIAM{}

  // reports this record in Assigned. Assigned only updates in the status after
  // the record has been checkpointed to disk. When the Kubelet is restarted,
  // it tries to make the Assigned config the Active config by loading and
  // validating the checkpointed payload identified by Assigned.
  // +optional
  optional NodeConfigSource assigned = 1;

## The `password` flow

Now let's go back a bit and understand what is all that.

The `password` "flow" is one of the ways ("flows") defined in OAuth2, to handle security and authentication.

OAuth2 was designed so that the backend or API could be independent of the server that authenticates the user.

But in this case, the same **FastAPI** application will handle the API and the authentication.