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Put Block (REST API)

Updated: February 5, 2014

The Put Block operation creates a new block to be committed as part of a blob.

The Put Block request may be constructed as follows. HTTPS is recommended. Replace myaccount with the name of your storage account:


  PUT Method Request URI HTTP Version



Emulated Storage Service URI

When making a request against the emulated storage service, specify the emulator hostname and Blob service port as, followed by the emulated storage account name:


  PUT Method Request URI HTTP Version


For more information, see About Development Storage.

URI Parameters


Parameter Description


Required. A valid Base64 string value that identifies the block. Prior to encoding, the string must be less than or equal to 64 bytes in size.

For a given blob, the length of the value specified for the blockid parameter must be the same size for each block.

Note that the Base64 string must be URL-encoded.


Optional. The timeout parameter is expressed in seconds. For more information, see Setting Timeouts for Blob Service Operations.

Request Headers

The following table describes required and optional request headers.


Request Header Description


Required. Specifies the authentication scheme, account name, and signature. See Authentication for the Windows Azure Storage Services for more information.

Date or x-ms-date

Required. Specifies the Coordinated Universal Time (UTC) for the request. For more information, see Authentication for the Windows Azure Storage Services.


Required for all authenticated requests. Specifies the version of the operation to use for this request. For more information, see Versioning for the Blob, Queue, and Table Services in Windows Azure.


Required. The length of the block content in bytes. The block must be less than or equal to 4 MB in size.

When the length is not provided, the operation will fail with the status code 411 (Length Required).


Optional. An MD5 hash of the block content. This hash is used to verify the integrity of the block during transport. When this header is specified, the storage service compares the hash of the content that has arrived with this header value.

Note that this MD5 hash is not stored with the blob.

If the two hashes do not match, the operation will fail with error code 400 (Bad Request).


Required if the blob has an active lease. To perform this operation on a blob with an active lease, specify the valid lease ID for this header.


Optional. Provides a client-generated, opaque value with a 1 KB character limit that is recorded in the analytics logs when storage analytics logging is enabled. Using this header is highly recommended for correlating client-side activities with requests received by the server. For more information, see About Storage Analytics Logging and Windows Azure Logging: Using Logs to Track Storage Requests.

Request Body

The request body contains the content of the block.

Sample Request

Request Syntax:
PUT https://myaccount.blob.core.windows.net/mycontainer/myblob?comp=block&blockid=AAAAAA%3D%3D HTTP/1.1

Request Headers:
x-ms-version: 2011-08-18
x-ms-date: Sun, 25 Sep 2011 14:37:35 GMT
Authorization: SharedKey myaccount:J4ma1VuFnlJ7yfk/Gu1GxzbfdJloYmBPWlfhZ/xn7GI=
Content-Length: 1048576

The response includes an HTTP status code and a set of response headers.

Status Code

A successful operation returns status code 201 (Created).

For information about status codes, see Status and Error Codes.

Response Headers

The response for this operation includes the following headers. The response may also include additional standard HTTP headers. All standard headers conform to the HTTP/1.1 protocol specification.


Response header Description


This header is returned so that the client can check for message content integrity. The value of this header is computed by the Blob service; it is not necessarily the same value specified in the request headers.


This header uniquely identifies the request that was made and can be used for troubleshooting the request. For more information, see Troubleshooting API Operations.


Indicates the version of the Blob service used to execute the request. This header is returned for requests made against version 2009-09-19 and later.


A UTC date/time value generated by the service that indicates the time at which the response was initiated.

Sample Response

Response Status:
HTTP/1.1 201 Created

Response Headers:
Transfer-Encoding: chunked
Content-MD5: BN3lsXf+t19nMGs+vYakPA==
Date: Sun, 25 Sep 2011 23:47:09 GMT
Server: Windows-Azure-Blob/1.0 Microsoft-HTTPAPI/2.0

This operation can be called by the account owner and by anyone with a Shared Access Signature that has permission to write to this blob or its container.

Put Block uploads a block for future inclusion in a block blob. A block may be up to 4 MB in size.

After you have uploaded a set of blocks, you can create or update the blob on the server from this set by calling the Put Block List (REST API) operation. Each block in the set is identified by a block ID that is unique within that blob. Block IDs are scoped to a particular blob, so different blobs can have blocks with same IDs.

If you call Put Block on a blob that does not yet exist, a new block blob is created with a content length of 0. This blob is enumerated by the List Blobs operation if the include=uncommittedblobs option is specified. The block or blocks that you uploaded are not committed until you call Put Block List on the new blob. A blob created this way is maintained on the server for a week; if you have not added more blocks or committed blocks to the blob within that time period, then the blob is garbage collected.

The maximum blob size currently supported by the Put Block List operation is 200 GB, and up to 50,000 blocks. A blob can have a maximum of 100,000 uncommitted blocks at any given time, and the set of uncommitted blocks cannot exceed 400 GB in total size. If these maximums are exceeded, the service returns status code 413 (RequestEntityTooLarge).

A block that has been successfully uploaded with the Put Block operation does not become part of a blob until it is committed with Put Block List. Before Put Block List is called to commit the new or updated blob, any calls to Get Blob (REST API) return the blob contents without the inclusion of the uncommitted block.

If you upload a block that has the same block ID as another block that has not yet been committed, the last uploaded block with that ID will be committed on the next successful Put Block List operation.

After Put Block List is called, all uncommitted blocks specified in the block list are committed as part of the new blob. Any uncommitted blocks that were not specified in the block list for the blob will be garbage collected and removed from the Blob service. Any uncommitted blocks will also be garbage collected if there are no successful calls to Put Block or Put Block List on the same blob within a week following the last successful Put Block operation. If Put Blob (REST API) is called on the blob, any uncommitted blocks will be garbage collected.

If the blob has an active lease, the client must specify a valid lease ID on the request in order to write a block to the blob. If the client does not specify a lease ID, or specifies an invalid lease ID, the Blob service returns status code 412 (Precondition Failed). If the client specifies a lease ID but the blob does not have an active lease, the Blob service also returns status code 412 (Precondition Failed).

For a given blob, all block IDs must be the same length. If a block is uploaded with a block ID of a different length than the block IDs for any existing uncommitted blocks, the service returns error response code 400 (Bad Request).

If you attempt to upload a block that is larger than 4 MB, the service returns status code 413 (Request Entity Too Large). The service also returns additional information about the error in the response, including the maximum block size permitted in bytes.

Calling Put Block does not update the last modified time of an existing blob.

Calling Put Block on a page blob returns an error.

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