Struct aws_sdk_s3::client::fluent_builders::HeadObject

pub struct HeadObject<C = DynConnector, M = AwsMiddleware, R = Standard> { /* fields omitted */ }

Fluent builder constructing a request to HeadObject.

The HEAD action retrieves metadata from an object without returning the object itself. This action is useful if you're only interested in an object's metadata. To use HEAD, you must have READ access to the object.

A HEAD request has the same options as a GET action 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 404 Not Found or 403 Forbidden code. It is not possible to retrieve the exact exception beyond these error codes.

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:

• 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).

• Encryption request headers, like x-amz-server-side-encryption, should not be sent for GET requests if your object uses server-side encryption with KMS keys (SSE-KMS) or server-side encryption with Amazon S3–managed encryption keys (SSE-S3). If your object does use these types of keys, you’ll get an HTTP 400 BadRequest error.

• The last modified property in this case is the creation date of the object.

Request headers are limited to 8 KB in size. For more information, see Common Request Headers.

Consider the following when using request headers:

• Consideration 1 – If both of the If-Match and If-Unmodified-Since headers are present in the request as follows:

  • If-Match condition evaluates to true, and;

  • If-Unmodified-Since condition evaluates to false;

  Then Amazon S3 returns 200 OK and the data requested.

• Consideration 2 – If both of the If-None-Match and If-Modified-Since headers are present in the request as follows:

  • If-None-Match condition evaluates to false, and;

  • If-Modified-Since condition evaluates to true;

  Then Amazon S3 returns the 304 Not Modified response code.

For more information about conditional requests, see RFC 7232.

Permissions

You need the relevant read object (or version) permission for this operation. For more information, see Specifying Permissions in a Policy. If the object you request does not exist, the error Amazon S3 returns depends on whether you also have the s3:ListBucket permission.

• If you have the s3:ListBucket permission on the bucket, Amazon S3 returns an HTTP status code 404 ("no such key") error.

• If you don’t have the s3:ListBucket permission, Amazon S3 returns an HTTP status code 403 ("access denied") error.

The following action is related to HeadObject:

• GetObject

Implementations

impl<C, M, R> HeadObject<C, M, R> where
    C: SmithyConnector,
    M: SmithyMiddleware<C>,
    R: NewRequestPolicy, 

pub async fn send(self) -> Result<HeadObjectOutput, SdkError<HeadObjectError>> where
    R::Policy: SmithyRetryPolicy<HeadObjectInputOperationOutputAlias, HeadObjectOutput, HeadObjectError, HeadObjectInputOperationRetryAlias>, 

Sends the request and returns the response.

If an error occurs, an SdkError will be returned with additional details that can be matched against.

By default, any retryable failures will be retried twice. Retry behavior is configurable with the RetryConfig, which can be set when configuring the client.

pub fn bucket(self, inp: impl Into<String>) -> Self

The name of the bucket containing the object.

When using this action with an access point, 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.

When using 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 using this action using S3 on Outposts through the Amazon Web Services SDKs, you provide the Outposts bucket ARN in place of the bucket name. For more information about S3 on Outposts ARNs, see Using S3 on Outposts in the Amazon S3 User Guide.

pub fn set_bucket(self, input: Option<String>) -> Self

The name of the bucket containing the object.

When using this action with an access point, 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.

When using 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 using this action using S3 on Outposts through the Amazon Web Services SDKs, you provide the Outposts bucket ARN in place of the bucket name. For more information about S3 on Outposts ARNs, see Using S3 on Outposts in the Amazon S3 User Guide.

pub fn if_match(self, inp: impl Into<String>) -> Self

Return the object only if its entity tag (ETag) is the same as the one specified, otherwise return a 412 (precondition failed).

pub fn set_if_match(self, input: Option<String>) -> Self

Return the object only if its entity tag (ETag) is the same as the one specified, otherwise return a 412 (precondition failed).

pub fn if_modified_since(self, inp: Instant) -> Self

Return the object only if it has been modified since the specified time, otherwise return a 304 (not modified).

pub fn set_if_modified_since(self, input: Option<Instant>) -> Self

Return the object only if it has been modified since the specified time, otherwise return a 304 (not modified).

pub fn if_none_match(self, inp: impl Into<String>) -> Self

Return the object only if its entity tag (ETag) is different from the one specified, otherwise return a 304 (not modified).

pub fn set_if_none_match(self, input: Option<String>) -> Self

Return the object only if its entity tag (ETag) is different from the one specified, otherwise return a 304 (not modified).

pub fn if_unmodified_since(self, inp: Instant) -> Self

Return the object only if it has not been modified since the specified time, otherwise return a 412 (precondition failed).

pub fn set_if_unmodified_since(self, input: Option<Instant>) -> Self

Return the object only if it has not been modified since the specified time, otherwise return a 412 (precondition failed).

pub fn key(self, inp: impl Into<String>) -> Self

The object key.

pub fn set_key(self, input: Option<String>) -> Self

The object key.

pub fn range(self, inp: impl Into<String>) -> Self

Downloads the specified range bytes of an object. For more information about the HTTP Range header, see http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.35.

Amazon S3 doesn't support retrieving multiple ranges of data per GET request.

pub fn set_range(self, input: Option<String>) -> Self

Downloads the specified range bytes of an object. For more information about the HTTP Range header, see http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.35.

Amazon S3 doesn't support retrieving multiple ranges of data per GET request.

pub fn version_id(self, inp: impl Into<String>) -> Self

VersionId used to reference a specific version of the object.

pub fn set_version_id(self, input: Option<String>) -> Self

VersionId used to reference a specific version of the object.

pub fn sse_customer_algorithm(self, inp: impl Into<String>) -> Self

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

pub fn set_sse_customer_algorithm(self, input: Option<String>) -> Self

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

pub fn sse_customer_key(self, inp: impl Into<String>) -> Self

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.

pub fn set_sse_customer_key(self, input: Option<String>) -> Self

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.

pub fn sse_customer_key_md5(self, inp: impl Into<String>) -> Self

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.

pub fn set_sse_customer_key_md5(self, input: Option<String>) -> Self

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.

pub fn request_payer(self, inp: RequestPayer) -> Self

Confirms that the requester knows that they will be charged for the request. Bucket owners need not specify this parameter in their requests. For information about downloading objects from requester pays buckets, see Downloading Objects in Requestor Pays Buckets in the Amazon S3 User Guide.

pub fn set_request_payer(self, input: Option<RequestPayer>) -> Self

Confirms that the requester knows that they will be charged for the request. Bucket owners need not specify this parameter in their requests. For information about downloading objects from requester pays buckets, see Downloading Objects in Requestor Pays Buckets in the Amazon S3 User Guide.

pub fn part_number(self, inp: i32) -> Self

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.

pub fn set_part_number(self, input: Option<i32>) -> Self

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.

pub fn expected_bucket_owner(self, inp: impl Into<String>) -> Self

The account ID of the expected bucket owner. If the bucket is owned by a different account, the request will fail with an HTTP 403 (Access Denied) error.

pub fn set_expected_bucket_owner(self, input: Option<String>) -> Self

The account ID of the expected bucket owner. If the bucket is owned by a different account, the request will fail with an HTTP 403 (Access Denied) error.

Trait Implementations

impl<C: Debug, M: Debug, R: Debug> Debug for HeadObject<C, M, R>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.