}
		}
		delete(checkHeader, formCanonicalName)
	}
	// For SignV2 - Signature/AWSAccessKeyId field will be ignored.
	if _, ok := formValues[xhttp.AmzSignatureV2]; ok {
		delete(checkHeader, xhttp.AmzSignatureV2)
		for k := range checkHeader {
			// case-insensitivity for AWSAccessKeyId
			if strings.EqualFold(k, xhttp.AmzAccessKeyID) {
				delete(checkHeader, k)
				break
			}
		}
	}

	AmzEncryptionAES = "AES256"
	AmzEncryptionKMS = "aws:kms"

	// Signature v2 related constants
	AmzSignatureV2 = "Signature"
	AmzAccessKeyID = "AWSAccessKeyId"

	// Response request id.
	AmzRequestID     = "x-amz-request-id"
	AmzRequestHostID = "x-amz-id-2"

	// Deployment id.
	MinioDeploymentID = "x-minio-deployment-id"

	// Peer call

	// Construct the final presigned URL.
	return nil
}

// preSignV2 - presign the request in following style.
// https://${S3_BUCKET}.s3.amazonaws.com/${S3_OBJECT}?AWSAccessKeyId=${S3_ACCESS_KEY}&Expires=${TIMESTAMP}&Signature=${SIGNATURE}.
func preSignV2(req *http.Request, accessKeyID, secretAccessKey string, expires int64) error {
	// Presign is not needed for anonymous credentials.