S3 Head Object

Key	Datatype	Required	Description
`partNumber`	null		Part number to read, between 1 and 10,000.
`versionId`	null		VersionId to read.

Key	Datatype	Description
`If-Match`	null	Optional. Only return the object if its ETag matches this value, otherwise return a 412 (precondition failed) error.
`If-Modified-Since`	null	Optional. Only copy the object if it has been modified since this time, otherwise return a 304 (not modified) response.
`If-None-Match`	null	Optional. Only copy the object if its ETag does not match this value, otherwise return a 304 (not modified) response.
`If-Unmodified-Since`	null	Optional. Only copy the object if it has not been modified since this time, otherwise return a 412 (precondition failed) error.
`Range`	null	Optional. The HTTP range of bytes required, for example, bytes=0-999
`x-amz-expected-bucket-owner`	null	Optional. Account ID of the expected bucket owner. If the bucket is owned by a different owner, a 403 Access Denied error will be returned.
`x-amz-server-side-encryption-customer-algorithm`	null	Optional. Encryption algorithm to be used for SSE-C.
`x-amz-server-side-encryption-customer-key`	null	Optional. Base64-encoded customer key for SSE-C.
`x-backblaze-live-read-enabled`	null	Optional. To retrieve metadata from an ongoing multipart upload with Live Read enabled, the value must be TRUE.
Any value other than TRUE (case-insensitive) is treated as false.

status: OK

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