PutObject

Adds an object to a bucket.

Note

• Amazon S3 never adds partial objects; if you receive a success response, Amazon S3 added the entire object to the bucket. You cannot use PutObject to only update a single piece of metadata for an existing object. You must put the entire object with updated metadata if you want to update some values.

• If your bucket uses the bucket owner enforced setting for Object Ownership, ACLs are disabled and no longer affect permissions. All objects written to the bucket by any account will be owned by the bucket owner.

• Directory buckets - For directory buckets, you must make requests for this API operation to the Zonal endpoint. These endpoints support virtual-hosted-style requests in the format https://bucket-name.s3express-zone-id.region-code.amazonaws.com/key-name . Path-style requests are not supported. For more information about endpoints in Availability Zones, see Regional and Zonal endpoints for directory buckets in Availability Zones in the Amazon S3 User Guide. For more information about endpoints in Local Zones, see Concepts for directory buckets in Local Zones in the Amazon S3 User Guide.

Amazon S3 is a distributed system. If it receives multiple write requests for the same object simultaneously, it overwrites all but the last object written. However, Amazon S3 provides features that can modify this behavior:

• S3 Object Lock - To prevent objects from being deleted or overwritten, you can use Amazon S3 Object Lock in the Amazon S3 User Guide.

  Note

  This functionality is not supported for directory buckets.

• If-None-Match - Uploads the object only if the object key name does not already exist in the specified bucket. Otherwise, Amazon S3 returns a 412 Precondition Failed error. If a conflicting operation occurs during the upload, S3 returns a 409 ConditionalRequestConflict response. On a 409 failure, retry the upload.

  Expects the * character (asterisk).

  For more information, see Add preconditions to S3 operations with conditional requests in the Amazon S3 User Guide or RFC 7232.

  Note

  This functionality is not supported for S3 on Outposts.

• S3 Versioning - When you enable versioning for a bucket, if Amazon S3 receives multiple write requests for the same object simultaneously, it stores all versions of the objects. For each write request that is made to the same object, Amazon S3 automatically generates a unique version ID of that object being stored in Amazon S3. You can retrieve, replace, or delete any version of the object. For more information about versioning, see Adding Objects to Versioning-Enabled Buckets in the Amazon S3 User Guide. For information about returning the versioning state of a bucket, see GetBucketVersioning.

  Note

  This functionality is not supported for directory buckets.

Permissions

• General purpose bucket permissions - The following permissions are required in your policies when your PutObject request includes specific headers.

  • s3:PutObject - To successfully complete the PutObject request, you must always have the s3:PutObject permission on a bucket to add an object to it.

  • s3:PutObjectAcl - To successfully change the objects ACL of your PutObject request, you must have the s3:PutObjectAcl.

  • s3:PutObjectTagging - To successfully set the tag-set with your PutObject request, you must have the s3:PutObjectTagging.

• Directory bucket permissions - To grant access to this API operation on a directory bucket, we recommend that you use the CreateSession 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. AWS 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.

  If the object is encrypted with SSE-KMS, you must also have the kms:GenerateDataKey and kms:Decrypt permissions in IAM identity-based policies and AWS KMS key policies for the AWS KMS key.

Data integrity with Content-MD5

• General purpose bucket - To ensure that data is not corrupted traversing the network, use the Content-MD5 header. When you use this header, Amazon S3 checks the object against the provided MD5 value and, if they do not match, Amazon S3 returns an error. Alternatively, when the object's ETag is its MD5 digest, you can calculate the MD5 while putting the object to Amazon S3 and compare the returned ETag to the calculated MD5 value.

• Directory bucket - This functionality is not supported for directory buckets.

HTTP Host header syntax

Directory buckets - The HTTP Host header syntax is Bucket-name.s3express-zone-id.region-code.amazonaws.com.

For more information about related Amazon S3 APIs, see the following:

• CopyObject

• DeleteObject

Request Syntax

PUT /Key+ HTTP/1.1
Host: Bucket.s3.amazonaws.com
x-amz-acl: ACL
Cache-Control: CacheControl
Content-Disposition: ContentDisposition
Content-Encoding: ContentEncoding
Content-Language: ContentLanguage
Content-Length: ContentLength
Content-MD5: ContentMD5
Content-Type: ContentType
x-amz-sdk-checksum-algorithm: ChecksumAlgorithm
x-amz-checksum-crc32: ChecksumCRC32
x-amz-checksum-crc32c: ChecksumCRC32C
x-amz-checksum-sha1: ChecksumSHA1
x-amz-checksum-sha256: ChecksumSHA256
Expires: Expires
If-Match: IfMatch
If-None-Match: IfNoneMatch
x-amz-grant-full-control: GrantFullControl
x-amz-grant-read: GrantRead
x-amz-grant-read-acp: GrantReadACP
x-amz-grant-write-acp: GrantWriteACP
x-amz-write-offset-bytes: WriteOffsetBytes
x-amz-server-side-encryption: ServerSideEncryption
x-amz-storage-class: StorageClass
x-amz-website-redirect-location: WebsiteRedirectLocation
x-amz-server-side-encryption-customer-algorithm: SSECustomerAlgorithm
x-amz-server-side-encryption-customer-key: SSECustomerKey
x-amz-server-side-encryption-customer-key-MD5: SSECustomerKeyMD5
x-amz-server-side-encryption-aws-kms-key-id: SSEKMSKeyId
x-amz-server-side-encryption-context: SSEKMSEncryptionContext
x-amz-server-side-encryption-bucket-key-enabled: BucketKeyEnabled
x-amz-request-payer: RequestPayer
x-amz-tagging: Tagging
x-amz-object-lock-mode: ObjectLockMode
x-amz-object-lock-retain-until-date: ObjectLockRetainUntilDate
x-amz-object-lock-legal-hold: ObjectLockLegalHoldStatus
x-amz-expected-bucket-owner: ExpectedBucketOwner

Body

URI Request Parameters

The request uses the following URI parameters.

Bucket

The bucket name to which the PUT action was initiated.

Directory buckets - When you use this operation with a directory bucket, you must use virtual-hosted-style requests in the format Bucket-name.s3express-zone-id.region-code.amazonaws.com. Path-style requests are not supported. Directory bucket names must be unique in the chosen Zone (Availability Zone or Local Zone). Bucket names must follow the format bucket-base-name--zone-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 AWS 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 AWS 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.

Required: Yes

Cache-Control

Can be used to specify caching behavior along the request/reply chain. For more information, see http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.9.

Content-Disposition

Specifies presentational information for the object. For more information, see https://www.rfc-editor.org/rfc/rfc6266#section-4.

Content-Encoding

Specifies 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. For more information, see https://www.rfc-editor.org/rfc/rfc9110.html#field.content-encoding.

Content-Language

The language the content is in.

Content-Length

Size of the body in bytes. This parameter is useful when the size of the body cannot be determined automatically. For more information, see https://www.rfc-editor.org/rfc/rfc9110.html#name-content-length.

Content-MD5

The base64-encoded 128-bit MD5 digest of the message (without the headers) according to RFC 1864. This header can be used as a message integrity check to verify that the data is the same data that was originally sent. Although it is optional, we recommend using the Content-MD5 mechanism as an end-to-end integrity check. For more information about REST request authentication, see REST Authentication.

Note

The Content-MD5 or x-amz-sdk-checksum-algorithm header is required for any request to upload an object with a retention period configured using Amazon S3 Object Lock. For more information, see Uploading objects to an Object Lock enabled bucket in the Amazon S3 User Guide.

Note

This functionality is not supported for directory buckets.

Content-Type

A standard MIME type describing the format of the contents. For more information, see https://www.rfc-editor.org/rfc/rfc9110.html#name-content-type.

Expires

The date and time at which the object is no longer cacheable. For more information, see https://www.rfc-editor.org/rfc/rfc7234#section-5.3.

If-Match

Uploads the object only if the ETag (entity tag) value provided during the WRITE operation matches the ETag of the object in S3. If the ETag values do not match, the operation returns a 412 Precondition Failed error.

If a conflicting operation occurs during the upload S3 returns a 409 ConditionalRequestConflict response. On a 409 failure you should fetch the object's ETag and retry the upload.

Expects the ETag value as a string.

For more information about conditional requests, see RFC 7232, or Conditional requests in the Amazon S3 User Guide.

If-None-Match

Uploads the object only if the object key name does not already exist in the bucket specified. Otherwise, Amazon S3 returns a 412 Precondition Failed error.

If a conflicting operation occurs during the upload S3 returns a 409 ConditionalRequestConflict response. On a 409 failure you should retry the upload.

Expects the '*' (asterisk) character.

For more information about conditional requests, see RFC 7232, or Conditional requests in the Amazon S3 User Guide.

Key

Object key for which the PUT action was initiated.

Length Constraints: Minimum length of 1.

Required: Yes

x-amz-acl

The canned ACL to apply to the object. For more information, see Canned ACL in the Amazon S3 User Guide.

When adding a new object, you can use headers to grant ACL-based permissions to individual AWS accounts or to predefined groups defined by Amazon S3. These permissions are then added to the ACL on the object. By default, all objects are private. Only the owner has full access control. For more information, see Access Control List (ACL) Overview and Managing ACLs Using the REST API in the Amazon S3 User Guide.

If the bucket that you're uploading objects to uses the bucket owner enforced setting for S3 Object Ownership, ACLs are disabled and no longer affect permissions. Buckets that use this setting only accept PUT requests that don't specify an ACL or PUT requests that specify bucket owner full control ACLs, such as the bucket-owner-full-control canned ACL or an equivalent form of this ACL expressed in the XML format. PUT requests that contain other ACLs (for example, custom grants to certain AWS accounts) fail and return a 400 error with the error code AccessControlListNotSupported. For more information, see Controlling ownership of objects and disabling ACLs in the Amazon S3 User Guide.

Note

• This functionality is not supported for directory buckets.

• This functionality is not supported for Amazon S3 on Outposts.

Valid Values: private | public-read | public-read-write | authenticated-read | aws-exec-read | bucket-owner-read | bucket-owner-full-control

x-amz-checksum-crc32

This header can be used as a data integrity check to verify that the data received is the same data that was originally sent. This header specifies the base64-encoded, 32-bit CRC-32 checksum of the object. For more information, see Checking object integrity in the Amazon S3 User Guide.

x-amz-checksum-crc32c

This header can be used as a data integrity check to verify that the data received is the same data that was originally sent. This header specifies the base64-encoded, 32-bit CRC-32C checksum of the object. For more information, see Checking object integrity in the Amazon S3 User Guide.

x-amz-checksum-sha1

This header can be used as a data integrity check to verify that the data received is the same data that was originally sent. This header specifies the base64-encoded, 160-bit SHA-1 digest of the object. For more information, see Checking object integrity in the Amazon S3 User Guide.

x-amz-checksum-sha256

This header can be used as a data integrity check to verify that the data received is the same data that was originally sent. This header specifies the base64-encoded, 256-bit SHA-256 digest of the object. For more information, see Checking object integrity in the Amazon S3 User Guide.

x-amz-expected-bucket-owner

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 code 403 Forbidden (access denied).

x-amz-grant-full-control

Gives the grantee READ, READ_ACP, and WRITE_ACP permissions on the object.

Note

• This functionality is not supported for directory buckets.

• This functionality is not supported for Amazon S3 on Outposts.

x-amz-grant-read

Allows grantee to read the object data and its metadata.

Note

• This functionality is not supported for directory buckets.

• This functionality is not supported for Amazon S3 on Outposts.

x-amz-grant-read-acp

Allows grantee to read the object ACL.

Note

• This functionality is not supported for directory buckets.

• This functionality is not supported for Amazon S3 on Outposts.

x-amz-grant-write-acp

Allows grantee to write the ACL for the applicable object.

Note

• This functionality is not supported for directory buckets.

• This functionality is not supported for Amazon S3 on Outposts.

x-amz-object-lock-legal-hold

Specifies whether a legal hold will be applied to this object. For more information about S3 Object Lock, see Object Lock in the Amazon S3 User Guide.

Note

This functionality is not supported for directory buckets.

Valid Values: ON | OFF

x-amz-object-lock-mode

The Object Lock mode that you want to apply to this object.

Note

This functionality is not supported for directory buckets.

Valid Values: GOVERNANCE | COMPLIANCE

x-amz-object-lock-retain-until-date

The date and time when you want this object's Object Lock to expire. Must be formatted as a timestamp parameter.

Note

This functionality is not supported for directory buckets.

x-amz-request-payer

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.

Valid Values: requester

x-amz-sdk-checksum-algorithm

Indicates the algorithm used to create the checksum for the object when you use the SDK. This header will not provide any additional functionality if you don't use the SDK. When you send this header, there must be a corresponding x-amz-checksum-algorithm or x-amz-trailer header sent. Otherwise, Amazon S3 fails the request with the HTTP status code 400 Bad Request.

For the x-amz-checksum-algorithm header, replace algorithm with the supported algorithm from the following list:

• CRC32

• CRC32C

• SHA1

• SHA256

For more information, see Checking object integrity in the Amazon S3 User Guide.

If the individual checksum value you provide through x-amz-checksum-algorithm doesn't match the checksum algorithm you set through x-amz-sdk-checksum-algorithm, Amazon S3 ignores any provided ChecksumAlgorithm parameter and uses the checksum algorithm that matches the provided value in x-amz-checksum-algorithm .

Note

The Content-MD5 or x-amz-sdk-checksum-algorithm header is required for any request to upload an object with a retention period configured using Amazon S3 Object Lock. For more information, see Uploading objects to an Object Lock enabled bucket in the Amazon S3 User Guide.

For directory buckets, when you use AWS SDKs, CRC32 is the default checksum algorithm that's used for performance.

Valid Values: CRC32 | CRC32C | SHA1 | SHA256

x-amz-server-side-encryption

The server-side encryption algorithm that was used when you store this object in Amazon S3 (for example, AES256, aws:kms, aws:kms:dsse).

• General purpose buckets - You have four mutually exclusive options to protect data using server-side encryption in Amazon S3, depending on how you choose to manage the encryption keys. Specifically, the encryption key options are Amazon S3 managed keys (SSE-S3), AWS KMS keys (SSE-KMS or DSSE-KMS), and customer-provided keys (SSE-C). Amazon S3 encrypts data with server-side encryption by using Amazon S3 managed keys (SSE-S3) by default. You can optionally tell Amazon S3 to encrypt data at rest by using server-side encryption with other key options. For more information, see Using Server-Side Encryption in the Amazon S3 User Guide.

• Directory buckets - For directory buckets, there are only two supported options for server-side encryption: server-side encryption with Amazon S3 managed keys (SSE-S3) (AES256) and server-side encryption with AWS KMS keys (SSE-KMS) (aws:kms). We recommend that the bucket's default encryption uses the desired encryption configuration and you don't override the bucket default encryption in your CreateSession requests or PUT object requests. Then, new objects are automatically encrypted with the desired encryption settings. For more information, see Protecting data with server-side encryption in the Amazon S3 User Guide. For more information about the encryption overriding behaviors in directory buckets, see Specifying server-side encryption with AWS KMS for new object uploads.

  In the Zonal endpoint API calls (except CopyObject and UploadPartCopy) using the REST API, the encryption request headers must match the encryption settings that are specified in the CreateSession request. You can't override the values of the encryption settings (x-amz-server-side-encryption, x-amz-server-side-encryption-aws-kms-key-id, x-amz-server-side-encryption-context, and x-amz-server-side-encryption-bucket-key-enabled) that are specified in the CreateSession request. You don't need to explicitly specify these encryption settings values in Zonal endpoint API calls, and Amazon S3 will use the encryption settings values from the CreateSession request to protect new objects in the directory bucket.

  Note

  When you use the CLI or the AWS SDKs, for CreateSession, the session token refreshes automatically to avoid service interruptions when a session expires. The CLI or the AWS SDKs use the bucket's default encryption configuration for the CreateSession request. It's not supported to override the encryption settings values in the CreateSession request. So in the Zonal endpoint API calls (except CopyObject and UploadPartCopy), the encryption request headers must match the default encryption configuration of the directory bucket.

Valid Values: AES256 | aws:kms | aws:kms:dsse

x-amz-server-side-encryption-aws-kms-key-id

Specifies the AWS KMS key ID (Key ID, Key ARN, or Key Alias) to use for object encryption. If the KMS key doesn't exist in the same account that's issuing the command, you must use the full Key ARN not the Key ID.

General purpose buckets - If you specify x-amz-server-side-encryption with aws:kms or aws:kms:dsse, this header specifies the ID (Key ID, Key ARN, or Key Alias) of the AWS KMS key to use. If you specify x-amz-server-side-encryption:aws:kms or x-amz-server-side-encryption:aws:kms:dsse, but do not provide x-amz-server-side-encryption-aws-kms-key-id, Amazon S3 uses the AWS managed key (aws/s3) to protect the data.

Directory buckets - To encrypt data using SSE-KMS, it's recommended to specify the x-amz-server-side-encryption header to aws:kms. Then, the x-amz-server-side-encryption-aws-kms-key-id header implicitly uses the bucket's default KMS customer managed key ID. If you want to explicitly set the x-amz-server-side-encryption-aws-kms-key-id header, it must match the bucket's default customer managed key (using key ID or ARN, not alias). Your SSE-KMS configuration can only support 1 customer managed key per directory bucket's lifetime. The AWS managed key (aws/s3) isn't supported. Incorrect key specification results in an HTTP 400 Bad Request error.

x-amz-server-side-encryption-bucket-key-enabled

Specifies whether Amazon S3 should use an S3 Bucket Key for object encryption with server-side encryption using AWS Key Management Service (AWS KMS) keys (SSE-KMS).

General purpose buckets - Setting this header to true causes Amazon S3 to use an S3 Bucket Key for object encryption with SSE-KMS. Also, specifying this header with a PUT action doesn't affect bucket-level settings for S3 Bucket Key.

Directory buckets - S3 Bucket Keys are always enabled for GET and PUT operations in a directory bucket and can’t be disabled. S3 Bucket Keys aren't supported, when you copy SSE-KMS encrypted objects from general purpose buckets to directory buckets, from directory buckets to general purpose buckets, or between directory buckets, through CopyObject, UploadPartCopy, the Copy operation in Batch Operations, or the import jobs. In this case, Amazon S3 makes a call to AWS KMS every time a copy request is made for a KMS-encrypted object.

x-amz-server-side-encryption-context

Specifies the AWS KMS Encryption Context as an additional encryption context to use for object encryption. The value of this header is a Base64-encoded string of a UTF-8 encoded JSON, which contains the encryption context as key-value pairs. This value is stored as object metadata and automatically gets passed on to AWS KMS for future GetObject operations on this object.

General purpose buckets - This value must be explicitly added during CopyObject operations if you want an additional encryption context for your object. For more information, see Encryption context in the Amazon S3 User Guide.

Directory buckets - You can optionally provide an explicit encryption context value. The value must match the default encryption context - the bucket Amazon Resource Name (ARN). An additional encryption context value is not supported.

x-amz-server-side-encryption-customer-algorithm

Specifies the algorithm to use when encrypting the object (for example, AES256).

Note

This functionality is not supported for directory buckets.

x-amz-server-side-encryption-customer-key

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.

x-amz-server-side-encryption-customer-key-MD5

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.

x-amz-storage-class

By default, Amazon S3 uses the STANDARD Storage Class to store newly created objects. The STANDARD storage class provides high durability and high availability. Depending on performance needs, you can specify a different Storage Class. For more information, see Storage Classes in the Amazon S3 User Guide.

Note

• For directory buckets, only the S3 Express One Zone storage class is supported to store newly created objects.

• Amazon S3 on Outposts only uses the OUTPOSTS Storage Class.

Valid Values: STANDARD | REDUCED_REDUNDANCY | STANDARD_IA | ONEZONE_IA | INTELLIGENT_TIERING | GLACIER | DEEP_ARCHIVE | OUTPOSTS | GLACIER_IR | SNOW | EXPRESS_ONEZONE

x-amz-tagging

The tag-set for the object. The tag-set must be encoded as URL Query parameters. (For example, "Key1=Value1")

Note

This functionality is not supported for directory buckets.

x-amz-website-redirect-location

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. For information about object metadata, see Object Key and Metadata in the Amazon S3 User Guide.

In the following example, the request header sets the redirect to an object (anotherPage.html) in the same bucket:

x-amz-website-redirect-location: /anotherPage.html

In the following example, the request header sets the object redirect to another website:

x-amz-website-redirect-location: http://www.example.com/

For more information about website hosting in Amazon S3, see Hosting Websites on Amazon S3 and How to Configure Website Page Redirects in the Amazon S3 User Guide.

Note

This functionality is not supported for directory buckets.

x-amz-write-offset-bytes

Specifies the offset for appending data to existing objects in bytes. The offset must be equal to the size of the existing object being appended to. If no object exists, setting this header to 0 will create a new object.

Note

This functionality is only supported for objects in the Amazon S3 Express One Zone storage class in directory buckets.

Request Body

The request accepts the following binary data.

Body

Response Syntax

HTTP/1.1 200
x-amz-expiration: Expiration
ETag: ETag
x-amz-checksum-crc32: ChecksumCRC32
x-amz-checksum-crc32c: ChecksumCRC32C
x-amz-checksum-sha1: ChecksumSHA1
x-amz-checksum-sha256: ChecksumSHA256
x-amz-server-side-encryption: ServerSideEncryption
x-amz-version-id: VersionId
x-amz-server-side-encryption-customer-algorithm: SSECustomerAlgorithm
x-amz-server-side-encryption-customer-key-MD5: SSECustomerKeyMD5
x-amz-server-side-encryption-aws-kms-key-id: SSEKMSKeyId
x-amz-server-side-encryption-context: SSEKMSEncryptionContext
x-amz-server-side-encryption-bucket-key-enabled: BucketKeyEnabled
x-amz-object-size: Size
x-amz-request-charged: RequestCharged

Response Elements

If the action is successful, the service sends back an HTTP 200 response.

The response returns the following HTTP headers.

ETag

Entity tag for the uploaded object.

General purpose buckets - To ensure that data is not corrupted traversing the network, for objects where the ETag is the MD5 digest of the object, you can calculate the MD5 while putting an object to Amazon S3 and compare the returned ETag to the calculated MD5 value.

Directory buckets - The ETag for the object in a directory bucket isn't the MD5 digest of the object.

x-amz-checksum-crc32

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.

x-amz-checksum-crc32c

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.

x-amz-checksum-sha1

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.

x-amz-checksum-sha256

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.

x-amz-expiration

If the expiration is configured for the object (see PutBucketLifecycleConfiguration) in the Amazon S3 User Guide, the response includes this header. It includes the expiry-date and rule-id key-value pairs that provide information about object expiration. The value of the rule-id is URL-encoded.

Note

Object expiration information is not returned in directory buckets and this header returns the value "NotImplemented" in all responses for directory buckets.

x-amz-object-size

The size of the object in bytes. This will only be present if you append to an object.

Note

This functionality is only supported for objects in the Amazon S3 Express One Zone storage class in directory buckets.

x-amz-request-charged

If present, indicates that the requester was successfully charged for the request.

Note

This functionality is not supported for directory buckets.

Valid Values: requester

x-amz-server-side-encryption

The server-side encryption algorithm used when you store this object in Amazon S3.

Valid Values: AES256 | aws:kms | aws:kms:dsse

x-amz-server-side-encryption-aws-kms-key-id

If present, indicates the ID of the KMS key that was used for object encryption.

x-amz-server-side-encryption-bucket-key-enabled

Indicates whether the uploaded object uses an S3 Bucket Key for server-side encryption with AWS Key Management Service (AWS KMS) keys (SSE-KMS).

x-amz-server-side-encryption-context

If present, indicates the AWS KMS Encryption Context to use for object encryption. The value of this header is a Base64-encoded string of a UTF-8 encoded JSON, which contains the encryption context as key-value pairs. This value is stored as object metadata and automatically gets passed on to AWS KMS for future GetObject operations on this object.

x-amz-server-side-encryption-customer-algorithm

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.

x-amz-server-side-encryption-customer-key-MD5

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.

x-amz-version-id

Version ID of the object.

If you enable versioning for a bucket, Amazon S3 automatically generates a unique version ID for the object being stored. Amazon S3 returns this ID in the response. When you enable versioning for a bucket, if Amazon S3 receives multiple write requests for the same object simultaneously, it stores all of the objects. For more information about versioning, see Adding Objects to Versioning-Enabled Buckets in the Amazon S3 User Guide. For information about returning the versioning state of a bucket, see GetBucketVersioning.

Note

This functionality is not supported for directory buckets.

Errors

EncryptionTypeMismatch

The existing object was created with a different encryption type. Subsequent write requests must include the appropriate encryption parameters in the request or while creating the session.

HTTP Status Code: 400

InvalidRequest

You may receive this error in multiple cases. Depending on the reason for the error, you may receive one of the messages below:

• Cannot specify both a write offset value and user-defined object metadata for existing objects.

• Checksum Type mismatch occurred, expected checksum Type: sha1, actual checksum Type: crc32c.

• Request body cannot be empty when 'write offset' is specified.

HTTP Status Code: 400

InvalidWriteOffset

The write offset value that you specified does not match the current object size.

HTTP Status Code: 400

TooManyParts

You have attempted to add more parts than the maximum of 10000 that are allowed for this object. You can use the CopyObject operation to copy this object to another and then add more data to the newly copied object.

HTTP Status Code: 400

Examples

Example 1 for general purpose buckets: Upload an object

The following request stores the my-image.jpg file in the myBucket bucket.

PUT /my-image.jpg HTTP/1.1
Host: myBucket.s3.<Region>.amazonaws.com
Date: Wed, 12 Oct 2009 17:50:00 GMT
Authorization: authorization string
Content-Type: text/plain
Content-Length: 11434
x-amz-meta-author: Janet
Expect: 100-continue
[11434 bytes of object data]
         

Sample Response for general purpose buckets: Versioning suspended

This example illustrates one usage of PutObject.

HTTP/1.1 100 Continue

HTTP/1.1 200 OK
x-amz-id-2: LriYPLdmOdAiIfgSm/F1YsViT1LW94/xUQxMsF7xiEb1a0wiIOIxl+zbwZ163pt7
x-amz-request-id: 0A49CE4060975EAC
Date: Wed, 12 Oct 2009 17:50:00 GMT
ETag: "1b2cf535f27731c974343645a3985328"
Content-Length: 0
Connection: close
Server: AmazonS3
         

Sample Response for general purpose buckets: Expiration rule created using lifecycle configuration

If an expiration rule that was created on the bucket using lifecycle configuration applies to the object, you get a response with an x-amz-expiration header, as shown in the following response. For more information, see Transitioning Objects: General Considerations.

HTTP/1.1 100 Continue

HTTP/1.1 200 OK
x-amz-id-2: LriYPLdmOdAiIfgSm/F1YsViT1LW94/xUQxMsF7xiEb1a0wiIOIxl+zbwZ163pt7
x-amz-request-id: 0A49CE4060975EAC
Date: Wed, 12 Oct 2009 17:50:00 GMT
x-amz-expiration: expiry-date="Fri, 23 Dec 2012 00:00:00 GMT", rule-id="1"
ETag: "1b2cf535f27731c974343645a3985328"
Content-Length: 0
Connection: close
Server: AmazonS3
         

Sample Response for general purpose buckets: Versioning enabled

If the bucket has versioning enabled, the response includes the x-amz-version-id header.

HTTP/1.1 100 Continue

HTTP/1.1 200 OK
x-amz-id-2: LriYPLdmOdAiIfgSm/F1YsViT1LW94/xUQxMsF7xiEb1a0wiIOIxl+zbwZ163pt7
x-amz-request-id: 0A49CE4060975EAC
x-amz-version-id: 43jfkodU8493jnFJD9fjj3HHNVfdsQUIFDNsidf038jfdsjGFDSIRp
Date: Wed, 12 Oct 2009 17:50:00 GMT
ETag: "fbacf535f27731c9771645a39863328"
Content-Length: 0
Connection: close
Server: AmazonS3
         

Example 2 for general purpose buckets: Specifying the Reduced Redundancy Storage Class

The following request stores the image, my-image.jpg, in the myBucket bucket. The request specifies the x-amz-storage-class header to request that the object is stored using the REDUCED_REDUNDANCY storage class.

PUT /my-image.jpg HTTP/1.1
Host: myBucket.s3.<Region>.amazonaws.com
Date: Wed, 12 Oct 2009 17:50:00 GMT
Authorization: authorization string
Content-Type: image/jpeg
Content-Length: 11434
Expect: 100-continue
x-amz-storage-class: REDUCED_REDUNDANCY
         

Sample Response for general purpose buckets

This example illustrates one usage of PutObject.

HTTP/1.1 100 Continue

HTTP/1.1 200 OK
x-amz-id-2: LriYPLdmOdAiIfgSm/F1YsViT1LW94/xUQxMsF7xiEb1a0wiIOIxl+zbwZ163pt7
x-amz-request-id: 0A49CE4060975EAC
Date: Wed, 12 Oct 2009 17:50:00 GMT
ETag: "1b2cf535f27731c974343645a3985328"
Content-Length: 0
Connection: close
Server: AmazonS3
         

Example 3 for general purpose buckets: Uploading an object and specifying access permissions explicitly

The following request stores the TestObject.txt file in the myBucket bucket. The request specifies various ACL headers to grant permission to AWS accounts that are specified with a canonical user ID and an email address.

PUT TestObject.txt HTTP/1.1
Host: myBucket.s3.<Region>.amazonaws.com
x-amz-date: Fri, 13 Apr 2012 05:40:14 GMT
Authorization: authorization string
x-amz-grant-write-acp: id=8a6925ce4adf588a4532142d3f74dd8c71fa124ExampleCanonicalUserID
x-amz-grant-full-control: emailAddress="[e-mail]"
x-amz-grant-write: emailAddress="[e-mail]", emailAddress="[e-mail]"
Content-Length: 300
Expect: 100-continue
Connection: Keep-Alive

...Object data in the body...
         

Sample Response for general purpose buckets

This example illustrates one usage of PutObject.

HTTP/1.1 200 OK
x-amz-id-2: RUxG2sZJUfS+ezeAS2i0Xj6w/ST6xqF/8pFNHjTjTrECW56SCAUWGg+7QLVoj1GH
x-amz-request-id: 8D017A90827290BA
Date: Fri, 13 Apr 2012 05:40:25 GMT
ETag: "dd038b344cf9553547f8b395a814b274"
Content-Length: 0
Server: AmazonS3
         

Example 4 for general purpose buckets: Using a canned ACL to set access permissions

The following request stores the TestObject.txt file in the myBucket bucket. The request uses an x-amz-acl header to specify a canned ACL that grants READ permission to the public.

PUT TestObject.txt HTTP/1.1
Host: myBucket.s3.<Region>.amazonaws.com
x-amz-date: Fri, 13 Apr 2012 05:54:57 GMT
x-amz-acl: public-read
Authorization: authorization string
Content-Length: 300
Expect: 100-continue
Connection: Keep-Alive

...Object data in the body...
         

Sample Response for general purpose buckets

This example illustrates one usage of PutObject.

HTTP/1.1 200 OK
x-amz-id-2: Yd6PSJxJFQeTYJ/3dDO7miqJfVMXXW0S2Hijo3WFs4bz6oe2QCVXasxXLZdMfASd
x-amz-request-id: 80DF413BB3D28A25
Date: Fri, 13 Apr 2012 05:54:59 GMT
ETag: "dd038b344cf9553547f8b395a814b274"
Content-Length: 0
Server: AmazonS3
         

Example 5 for general purpose buckets: Upload an object (Request server-side encryption using a customer-provided encryption key)

This example of an upload object requests server-side encryption and provides an encryption key.

PUT /example-object HTTP/1.1
Host: example-bucket.s3.<Region>.amazonaws.com   
Accept: */*   
Authorization:authorization string   
Date: Wed, 28 May 2014 19:31:11 +0000   
x-amz-server-side-encryption-customer-key:g0lCfA3Dv40jZz5SQJ1ZukLRFqtI5WorC/8SEEXAMPLE   
x-amz-server-side-encryption-customer-key-MD5:ZjQrne1X/iTcskbY2example   
x-amz-server-side-encryption-customer-algorithm:AES256    
         

Sample Response for general purpose buckets

In the response, Amazon S3 returns the encryption algorithm and MD5 of the encryption key that you specified when uploading the object. The ETag that is returned is not the MD5 of the object.

HTTP/1.1 200 OK   
x-amz-id-2: 7qoYGN7uMuFuYS6m7a4lszH6in+hccE+4DXPmDZ7C9KqucjnZC1gI5mshai6fbMG   
x-amz-request-id: 06437EDD40C407C7   
Date: Wed, 28 May 2014 19:31:12 GMT   
x-amz-server-side-encryption-customer-algorithm: AES256   
x-amz-server-side-encryption-customer-key-MD5: ZjQrne1X/iTcskbY2example   
ETag: "ae89237c20e759c5f479ece02c642f59"      
         

Example 6 for general purpose buckets: Upload an object and specify tags

This example of an upload object request specifies the optional x-amz-tagging header to add tags to the object.

After the object is created, Amazon S3 stores the specified object tags in the tagging subresource that is associated with the object. For more information about tagging, see Object Tagging and Access Control Policies in the Amazon S3 User Guide.

PUT /example-object HTTP/1.1
Host: example-bucket.s3.<Region>.amazonaws.com   
Accept: */*   
Authorization:authorization string   
Date: Thu, 22 Sep 2016 21:58:13 GMT   
x-amz-tagging: tag1=value1&tag2=value2

[... bytes of object data]   
         

Sample Response for general purpose buckets

This example illustrates one usage of PutObject.

HTTP/1.1 200 OK   
x-amz-id-2: 7qoYGN7uMuFuYS6m7a4lszH6in+hccE+4DXPmDZ7C9KqucjnZC1gI5mshai6fbMG   
x-amz-request-id: 06437EDD40C407C7   
Date: Thu, 22 Sep 2016 21:58:17 GMT   
         

Example 7 for general purpose buckets: Upload an object and specify the checksum algorithm

This example of an upload object request specifies the additional checksum algorithm to use to verify the content of the object. For more information about using additional checksums, see Checking object integrity in the Amazon S3 User Guide.

PUT /example-object HTTP/1.1
Host: example-bucket.s3.<Region>.amazonaws.com
x-amz-date: Mon, 22 Mar 2021 23:00:00 GMT
Authorization: authorization string
Content-Length: 268435456
x-amz-checksum-sha256: 0ea4be78f6c3948588172edc6d8789ffe3cec461f385e0ac447e581731c429b5
[268435456 bytes of object data in the body]
         

Sample Response for general purpose buckets

This example illustrates one usage of PutObject.

HTTP/1.1 200 OK
x-amz-id-2: 7qoYGN7uMuFuYS6m7a4lszH6in+hccE+4DXPmDZ7C9KqucjnZC1gI5mshai6fbMG
x-amz-request-id: 49CFA2051300FBE9
Date: Mon, 22 Mar 2021 23:00:12 GMT
         

Example 8 for directory buckets: Upload an object and append to it

The following request creates the my-application.log file in the mybucket bucket, and appends to it afterwards.

PUT /my-application.log HTTP/1.1
Host: mybucket--usw2-az1--x-s3
Date: Fri, 22 Nov 2024 17:50:00 GMT
Authorization: authorization string
Content-Type: text/plain
Content-Length: 1048576
[1048576 bytes of object data]

PUT /my-application.log HTTP/1.1
Host: mybucket--usw2-az1--x-s3
Date: Fri, 22 Nov 2024 17:50:00 GMT
Authorization: authorization string
Content-Type: text/plain
Content-Length: 524288
x-amz-write-offset-bytes: 1048576
[524288 bytes of object data]
         

Sample Response for directory buckets

This example illustrates one usage of PutObject.

HTTP/1.1 200 OK
x-amz-request-id: 06437EDD40C407C7
x-amz-id-2: 7qoYGN7uMuFuYS6m7a4lszH6in+hccE+4DXPmDZ7C9KqucjnZC1gI5mshai6fbMG   
etag: "ae89237c20e759c5f479ece02c642f59"
x-amz-object-size: 1572864
         

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following:

• AWS Command Line Interface

• AWS SDK for .NET

• AWS SDK for C++

• AWS SDK for Go v2

• AWS SDK for Java V2

• AWS SDK for JavaScript V3

• AWS SDK for PHP V3

• AWS SDK for Python

• AWS SDK for Ruby V3