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The HEAD
operation retrieves metadata from an object without returning the object itself. This operation is useful if you're interested only in an object's metadata.
HEAD
request has the same options as a GET
operation on an object. The response is identical to the GET
response except that there is no response body. Because of this, if the HEAD
request generates an error, it returns a generic code, such as 400 Bad Request
, 403 Forbidden
, 404 Not Found
, 405 Method Not Allowed
, 412 Precondition Failed
, or 304 Not Modified
. It's not possible to retrieve the exact exception of these error codes.Request headers are limited to 8 KB in size. For more information, see Common Request Headers .
Permissions
General purpose bucket permissions - To use HEAD
, you must have the s3:GetObject
permission. You need the relevant read object (or version) permission for this operation. For more information, see Actions, resources, and condition keys for Amazon S3 in the Amazon S3 User Guide . For more information about the permissions to S3 API operations by S3 resource types, see Required permissions for Amazon S3 API operations in the Amazon S3 User Guide . If the object you request doesn't exist, the error that Amazon S3 returns depends on whether you also have the s3:ListBucket
permission.
s3:ListBucket
permission on the bucket, Amazon S3 returns an HTTP status code 404 Not Found
error.s3:ListBucket
permission, Amazon S3 returns an HTTP status code 403 Forbidden
error.Directory bucket permissions - To grant access to this API operation on a directory bucket, we recommend that you use the ` CreateSession
https://docs.aws.amazon.com/AmazonS3/latest/API/API_CreateSession.html`__ API operation for session-based authorization. Specifically, you grant the s3express:CreateSession
permission to the directory bucket in a bucket policy or an IAM identity-based policy. Then, you make the CreateSession
API call on the bucket to obtain a session token. With the session token in your request header, you can make API requests to this operation. After the session token expires, you make another CreateSession
API call to generate a new session token for use. Amazon Web Services CLI or SDKs create session and refresh the session token automatically to avoid service interruptions when a session expires. For more information about authorization, see ` CreateSession
https://docs.aws.amazon.com/AmazonS3/latest/API/API_CreateSession.html`__ . If you enable x-amz-checksum-mode
in the request and the object is encrypted with Amazon Web Services Key Management Service (Amazon Web Services KMS), you must also have the kms:GenerateDataKey
and kms:Decrypt
permissions in IAM identity-based policies and KMS key policies for the KMS key to retrieve the checksum of the object.
Encryption
x-amz-server-side-encryption
, should not be sent for HEAD
requests if your object uses server-side encryption with Key Management Service (KMS) keys (SSE-KMS), dual-layer server-side encryption with Amazon Web Services KMS keys (DSSE-KMS), or server-side encryption with Amazon S3 managed encryption keys (SSE-S3). The x-amz-server-side-encryption
header is used when you PUT
an object to S3 and want to specify the encryption method. If you include this header in a HEAD
request for an object that uses these types of keys, you’ll get an HTTP 400 Bad Request
error. It's because the encryption method can't be changed when you retrieve the object.If you encrypt an object by using server-side encryption with customer-provided encryption keys (SSE-C) when you store the object in Amazon S3, then when you retrieve the metadata from the object, you must use the following headers to provide the encryption key for the server to be able to retrieve the object's metadata. The headers are:
x-amz-server-side-encryption-customer-algorithm
x-amz-server-side-encryption-customer-key
x-amz-server-side-encryption-customer-key-MD5
For more information about SSE-C, see Server-Side Encryption (Using Customer-Provided Encryption Keys) in the Amazon S3 User Guide .
Directory bucket - For directory buckets, there are only two supported options for server-side encryption: SSE-S3 and SSE-KMS. SSE-C isn't supported. For more information, see Protecting data with server-side encryption in the Amazon S3 User Guide .
Versioning
x-amz-delete-marker: true
in the response.405 Method Not Allowed
error and the Last-Modified: timestamp
response header.
- Directory buckets - Delete marker is not supported by directory buckets.
- Directory buckets - S3 Versioning isn't enabled and supported for directory buckets. For this API operation, only the
null
value of the version ID is supported by directory buckets. You can only specifynull
to theversionId
query parameter in the request.HTTP Host header syntax
Directory buckets - The HTTP Host header syntax is `` Bucket_name .s3express-az_id .*region* .amazonaws.com`` .
The following actions are related to HeadObject
:
See also: AWS API Documentation
head-object
--bucket <value>
[--if-match <value>]
[--if-modified-since <value>]
[--if-none-match <value>]
[--if-unmodified-since <value>]
--key <value>
[--range <value>]
[--response-cache-control <value>]
[--response-content-disposition <value>]
[--response-content-encoding <value>]
[--response-content-language <value>]
[--response-content-type <value>]
[--response-expires <value>]
[--version-id <value>]
[--sse-customer-algorithm <value>]
[--sse-customer-key <value>]
[--sse-customer-key-md5 <value>]
[--request-payer <value>]
[--part-number <value>]
[--expected-bucket-owner <value>]
[--checksum-mode <value>]
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]
[--debug]
[--endpoint-url <value>]
[--no-verify-ssl]
[--no-paginate]
[--output <value>]
[--query <value>]
[--profile <value>]
[--region <value>]
[--version <value>]
[--color <value>]
[--no-sign-request]
[--ca-bundle <value>]
[--cli-read-timeout <value>]
[--cli-connect-timeout <value>]
--bucket
(string)
The name of the bucket that contains the object.
Directory buckets - When you use this operation with a directory bucket, you must use virtual-hosted-style requests in the format `` Bucket_name .s3express-az_id .*region* .amazonaws.com`` . Path-style requests are not supported. Directory bucket names must be unique in the chosen Availability Zone. Bucket names must follow the format `` bucket_base_name --az-id --x-s3`` (for example, `` DOC-EXAMPLE-BUCKET --usw2-az1 --x-s3`` ). For information about bucket naming restrictions, see Directory bucket naming rules in the Amazon S3 User Guide .
Access points - When you use this action with an access point, you must provide the alias of the access point in place of the bucket name or specify the access point ARN. When using the access point ARN, you must direct requests to the access point hostname. The access point hostname takes the form AccessPointName -AccountId .s3-accesspoint.*Region* .amazonaws.com. When using this action with an access point through the Amazon Web Services SDKs, you provide the access point ARN in place of the bucket name. For more information about access point ARNs, see Using access points in the Amazon S3 User Guide .
Note
Access points and Object Lambda access points are not supported by directory buckets.S3 on Outposts - When you use this action with Amazon S3 on Outposts, you must direct requests to the S3 on Outposts hostname. The S3 on Outposts hostname takes the form `` AccessPointName -AccountId .*outpostID* .s3-outposts.*Region* .amazonaws.com`` . When you use this action with S3 on Outposts through the Amazon Web Services SDKs, you provide the Outposts access point ARN in place of the bucket name. For more information about S3 on Outposts ARNs, see What is S3 on Outposts? in the Amazon S3 User Guide .
--if-match
(string)
Return the object only if its entity tag (ETag) is the same as the one specified; otherwise, return a 412 (precondition failed) error.
If both of the
If-Match
andIf-Unmodified-Since
headers are present in the request as follows:
If-Match
condition evaluates totrue
, and;If-Unmodified-Since
condition evaluates tofalse
;Then Amazon S3 returns
200 OK
and the data requested.For more information about conditional requests, see RFC 7232 .
--if-modified-since
(timestamp)
Return the object only if it has been modified since the specified time; otherwise, return a 304 (not modified) error.
If both of the
If-None-Match
andIf-Modified-Since
headers are present in the request as follows:
If-None-Match
condition evaluates tofalse
, and;If-Modified-Since
condition evaluates totrue
;Then Amazon S3 returns the
304 Not Modified
response code.For more information about conditional requests, see RFC 7232 .
--if-none-match
(string)
Return the object only if its entity tag (ETag) is different from the one specified; otherwise, return a 304 (not modified) error.
If both of the
If-None-Match
andIf-Modified-Since
headers are present in the request as follows:
If-None-Match
condition evaluates tofalse
, and;If-Modified-Since
condition evaluates totrue
;Then Amazon S3 returns the
304 Not Modified
response code.For more information about conditional requests, see RFC 7232 .
--if-unmodified-since
(timestamp)
Return the object only if it has not been modified since the specified time; otherwise, return a 412 (precondition failed) error.
If both of the
If-Match
andIf-Unmodified-Since
headers are present in the request as follows:
If-Match
condition evaluates totrue
, and;If-Unmodified-Since
condition evaluates tofalse
;Then Amazon S3 returns
200 OK
and the data requested.For more information about conditional requests, see RFC 7232 .
--key
(string)
The object key.
--range
(string)
HeadObject returns only the metadata for an object. If the Range is satisfiable, only theContentLength
is affected in the response. If the Range is not satisfiable, S3 returns a416 - Requested Range Not Satisfiable
error.
--response-cache-control
(string)
Sets theCache-Control
header of the response.
--response-content-disposition
(string)
Sets theContent-Disposition
header of the response.
--response-content-encoding
(string)
Sets theContent-Encoding
header of the response.
--response-content-language
(string)
Sets theContent-Language
header of the response.
--response-content-type
(string)
Sets theContent-Type
header of the response.
--response-expires
(timestamp)
Sets theExpires
header of the response.
--version-id
(string)
Version ID used to reference a specific version of the object.
Note
For directory buckets in this API operation, only thenull
value of the version ID is supported.
--sse-customer-algorithm
(string)
Specifies the algorithm to use when encrypting the object (for example, AES256).
Note
This functionality is not supported for directory buckets.
--sse-customer-key
(string)
Specifies the customer-provided encryption key for Amazon S3 to use in encrypting data. This value is used to store the object and then it is discarded; Amazon S3 does not store the encryption key. The key must be appropriate for use with the algorithm specified in the
x-amz-server-side-encryption-customer-algorithm
header.Note
This functionality is not supported for directory buckets.
--sse-customer-key-md5
(string)
Specifies the 128-bit MD5 digest of the encryption key according to RFC 1321. Amazon S3 uses this header for a message integrity check to ensure that the encryption key was transmitted without error.
Note
This functionality is not supported for directory buckets.
--request-payer
(string)
Confirms that the requester knows that they will be charged for the request. Bucket owners need not specify this parameter in their requests. If either the source or destination S3 bucket has Requester Pays enabled, the requester will pay for corresponding charges to copy the object. For information about downloading objects from Requester Pays buckets, see Downloading Objects in Requester Pays Buckets in the Amazon S3 User Guide .
Note
This functionality is not supported for directory buckets.Possible values:
requester
--part-number
(integer)
Part number of the object being read. This is a positive integer between 1 and 10,000. Effectively performs a 'ranged' HEAD request for the part specified. Useful querying about the size of the part and the number of parts in this object.
--expected-bucket-owner
(string)
The account ID of the expected bucket owner. If the account ID that you provide does not match the actual owner of the bucket, the request fails with the HTTP status code403 Forbidden
(access denied).
--checksum-mode
(string)
To retrieve the checksum, this parameter must be enabled.
General purpose buckets - If you enable checksum mode and the object is uploaded with a checksum and encrypted with an Key Management Service (KMS) key, you must have permission to use the
kms:Decrypt
action to retrieve the checksum.Directory buckets - If you enable
ChecksumMode
and the object is encrypted with Amazon Web Services Key Management Service (Amazon Web Services KMS), you must also have thekms:GenerateDataKey
andkms:Decrypt
permissions in IAM identity-based policies and KMS key policies for the KMS key to retrieve the checksum of the object.Possible values:
ENABLED
--cli-input-json
(string)
Performs service operation based on the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton
. If other arguments are provided on the command line, the CLI values will override the JSON-provided values. It is not possible to pass arbitrary binary values using a JSON-provided value as the string will be taken literally.
--generate-cli-skeleton
(string)
Prints a JSON skeleton to standard output without sending an API request. If provided with no value or the value input
, prints a sample input JSON that can be used as an argument for --cli-input-json
. If provided with the value output
, it validates the command inputs and returns a sample output JSON for that command.
--debug
(boolean)
Turn on debug logging.
--endpoint-url
(string)
Override command's default URL with the given URL.
--no-verify-ssl
(boolean)
By default, the AWS CLI uses SSL when communicating with AWS services. For each SSL connection, the AWS CLI will verify SSL certificates. This option overrides the default behavior of verifying SSL certificates.
--no-paginate
(boolean)
Disable automatic pagination. If automatic pagination is disabled, the AWS CLI will only make one call, for the first page of results.
--output
(string)
The formatting style for command output.
--query
(string)
A JMESPath query to use in filtering the response data.
--profile
(string)
Use a specific profile from your credential file.
--region
(string)
The region to use. Overrides config/env settings.
--version
(string)
Display the version of this tool.
--color
(string)
Turn on/off color output.
--no-sign-request
(boolean)
Do not sign requests. Credentials will not be loaded if this argument is provided.
--ca-bundle
(string)
The CA certificate bundle to use when verifying SSL certificates. Overrides config/env settings.
--cli-read-timeout
(int)
The maximum socket read time in seconds. If the value is set to 0, the socket read will be blocking and not timeout. The default value is 60 seconds.
--cli-connect-timeout
(int)
The maximum socket connect time in seconds. If the value is set to 0, the socket connect will be blocking and not timeout. The default value is 60 seconds.
To use the following examples, you must have the AWS CLI installed and configured. See the Getting started guide in the AWS CLI User Guide for more information.
Unless otherwise stated, all examples have unix-like quotation rules. These examples will need to be adapted to your terminal's quoting rules. See Using quotation marks with strings in the AWS CLI User Guide .
The following command retrieves metadata for an object in a bucket named my-bucket
:
aws s3api head-object --bucket my-bucket --key index.html
Output:
{
"AcceptRanges": "bytes",
"ContentType": "text/html",
"LastModified": "Thu, 16 Apr 2015 18:19:14 GMT",
"ContentLength": 77,
"VersionId": "null",
"ETag": "\"30a6ec7e1a9ad79c203d05a589c8b400\"",
"Metadata": {}
}
DeleteMarker -> (boolean)
Specifies whether the object retrieved was (true) or was not (false) a Delete Marker. If false, this response header does not appear in the response.
Note
This functionality is not supported for directory buckets.
AcceptRanges -> (string)
Indicates that a range of bytes was specified.
Expiration -> (string)
If the object expiration is configured (see `
PutBucketLifecycleConfiguration
https://docs.aws.amazon.com/AmazonS3/latest/API/API_PutBucketLifecycleConfiguration.html`__ ), the response includes this header. It includes theexpiry-date
andrule-id
key-value pairs providing object expiration information. The value of therule-id
is URL-encoded.Note
This functionality is not supported for directory buckets.
Restore -> (string)
If the object is an archived object (an object whose storage class is GLACIER), the response includes this header if either the archive restoration is in progress (see RestoreObject or an archive copy is already restored.
If an archive copy is already restored, the header value indicates when Amazon S3 is scheduled to delete the object copy. For example:
x-amz-restore: ongoing-request="false", expiry-date="Fri, 21 Dec 2012 00:00:00 GMT"
If the object restoration is in progress, the header returns the value
ongoing-request="true"
.For more information about archiving objects, see Transitioning Objects: General Considerations .
Note
This functionality is not supported for directory buckets. Only the S3 Express One Zone storage class is supported by directory buckets to store objects.
ArchiveStatus -> (string)
The archive state of the head object.
Note
This functionality is not supported for directory buckets.
LastModified -> (timestamp)
Date and time when the object was last modified.
ContentLength -> (long)
Size of the body in bytes.
ChecksumCRC32 -> (string)
The base64-encoded, 32-bit CRC-32 checksum of the object. This will only be present if it was uploaded with the object. When you use an API operation on an object that was uploaded using multipart uploads, this value may not be a direct checksum value of the full object. Instead, it's a calculation based on the checksum values of each individual part. For more information about how checksums are calculated with multipart uploads, see Checking object integrity in the Amazon S3 User Guide .
ChecksumCRC32C -> (string)
The base64-encoded, 32-bit CRC-32C checksum of the object. This will only be present if it was uploaded with the object. When you use an API operation on an object that was uploaded using multipart uploads, this value may not be a direct checksum value of the full object. Instead, it's a calculation based on the checksum values of each individual part. For more information about how checksums are calculated with multipart uploads, see Checking object integrity in the Amazon S3 User Guide .
ChecksumSHA1 -> (string)
The base64-encoded, 160-bit SHA-1 digest of the object. This will only be present if it was uploaded with the object. When you use the API operation on an object that was uploaded using multipart uploads, this value may not be a direct checksum value of the full object. Instead, it's a calculation based on the checksum values of each individual part. For more information about how checksums are calculated with multipart uploads, see Checking object integrity in the Amazon S3 User Guide .
ChecksumSHA256 -> (string)
The base64-encoded, 256-bit SHA-256 digest of the object. This will only be present if it was uploaded with the object. When you use an API operation on an object that was uploaded using multipart uploads, this value may not be a direct checksum value of the full object. Instead, it's a calculation based on the checksum values of each individual part. For more information about how checksums are calculated with multipart uploads, see Checking object integrity in the Amazon S3 User Guide .
ETag -> (string)
An entity tag (ETag) is an opaque identifier assigned by a web server to a specific version of a resource found at a URL.
MissingMeta -> (integer)
This is set to the number of metadata entries not returned in
x-amz-meta
headers. This can happen if you create metadata using an API like SOAP that supports more flexible metadata than the REST API. For example, using SOAP, you can create metadata whose values are not legal HTTP headers.Note
This functionality is not supported for directory buckets.
VersionId -> (string)
Version ID of the object.
Note
This functionality is not supported for directory buckets.
CacheControl -> (string)
Specifies caching behavior along the request/reply chain.
ContentDisposition -> (string)
Specifies presentational information for the object.
ContentEncoding -> (string)
Indicates what content encodings have been applied to the object and thus what decoding mechanisms must be applied to obtain the media-type referenced by the Content-Type header field.
ContentLanguage -> (string)
The language the content is in.
ContentType -> (string)
A standard MIME type describing the format of the object data.
Expires -> (timestamp)
The date and time at which the object is no longer cacheable.
WebsiteRedirectLocation -> (string)
If the bucket is configured as a website, redirects requests for this object to another object in the same bucket or to an external URL. Amazon S3 stores the value of this header in the object metadata.
Note
This functionality is not supported for directory buckets.
ServerSideEncryption -> (string)
The server-side encryption algorithm used when you store this object in Amazon S3 (for example,AES256
,aws:kms
,aws:kms:dsse
).
Metadata -> (map)
A map of metadata to store with the object in S3.
key -> (string)
value -> (string)
SSECustomerAlgorithm -> (string)
If server-side encryption with a customer-provided encryption key was requested, the response will include this header to confirm the encryption algorithm that's used.
Note
This functionality is not supported for directory buckets.
SSECustomerKeyMD5 -> (string)
If server-side encryption with a customer-provided encryption key was requested, the response will include this header to provide the round-trip message integrity verification of the customer-provided encryption key.
Note
This functionality is not supported for directory buckets.
SSEKMSKeyId -> (string)
If present, indicates the ID of the KMS key that was used for object encryption.
BucketKeyEnabled -> (boolean)
Indicates whether the object uses an S3 Bucket Key for server-side encryption with Key Management Service (KMS) keys (SSE-KMS).
StorageClass -> (string)
Provides storage class information of the object. Amazon S3 returns this header for all objects except for S3 Standard storage class objects.
For more information, see Storage Classes .
Note
Directory buckets - Only the S3 Express One Zone storage class is supported by directory buckets to store objects.
RequestCharged -> (string)
If present, indicates that the requester was successfully charged for the request.
Note
This functionality is not supported for directory buckets.
ReplicationStatus -> (string)
Amazon S3 can return this header if your request involves a bucket that is either a source or a destination in a replication rule.
In replication, you have a source bucket on which you configure replication and destination bucket or buckets where Amazon S3 stores object replicas. When you request an object (
GetObject
) or object metadata (HeadObject
) from these buckets, Amazon S3 will return thex-amz-replication-status
header in the response as follows:
- If requesting an object from the source bucket , Amazon S3 will return the
x-amz-replication-status
header if the object in your request is eligible for replication. For example, suppose that in your replication configuration, you specify object prefixTaxDocs
requesting Amazon S3 to replicate objects with key prefixTaxDocs
. Any objects you upload with this key name prefix, for exampleTaxDocs/document1.pdf
, are eligible for replication. For any object request with this key name prefix, Amazon S3 will return thex-amz-replication-status
header with value PENDING, COMPLETED or FAILED indicating object replication status.- If requesting an object from a destination bucket , Amazon S3 will return the
x-amz-replication-status
header with value REPLICA if the object in your request is a replica that Amazon S3 created and there is no replica modification replication in progress.- When replicating objects to multiple destination buckets , the
x-amz-replication-status
header acts differently. The header of the source object will only return a value of COMPLETED when replication is successful to all destinations. The header will remain at value PENDING until replication has completed for all destinations. If one or more destinations fails replication the header will return FAILED.For more information, see Replication .
Note
This functionality is not supported for directory buckets.
PartsCount -> (integer)
The count of parts this object has. This value is only returned if you specifypartNumber
in your request and the object was uploaded as a multipart upload.
ObjectLockMode -> (string)
The Object Lock mode, if any, that's in effect for this object. This header is only returned if the requester has the
s3:GetObjectRetention
permission. For more information about S3 Object Lock, see Object Lock .Note
This functionality is not supported for directory buckets.
ObjectLockRetainUntilDate -> (timestamp)
The date and time when the Object Lock retention period expires. This header is only returned if the requester has the
s3:GetObjectRetention
permission.Note
This functionality is not supported for directory buckets.
ObjectLockLegalHoldStatus -> (string)
Specifies whether a legal hold is in effect for this object. This header is only returned if the requester has the
s3:GetObjectLegalHold
permission. This header is not returned if the specified version of this object has never had a legal hold applied. For more information about S3 Object Lock, see Object Lock .Note
This functionality is not supported for directory buckets.