Jaa

List Blobs

  • Artikkeli

The List Blobs operation returns a list of the blobs under the specified container.

Request

You can construct the List Blobs request as follows. HTTPS is recommended. Replace myaccount with the name of your storage account.

Method Request URI HTTP version
GET https://myaccount.blob.core.windows.net/mycontainer?restype=container&comp=list HTTP/1.1

Emulated storage service URI

When you make a request against the emulated storage service, specify the emulator hostname and Azure Blob Storage port as 127.0.0.1:10000, followed by the emulated storage account name.

Method Request URI HTTP version
GET http://127.0.0.1:10000/devstoreaccount1/mycontainer?restype=container&comp=list HTTP/1.1

For more information, see Use Azurite emulator for local Azure Storage development.

URI parameters

You can specify the following additional parameters on the URI.

Parameter Description
prefix Optional. Filters the results to return only blobs with names that begin with the specified prefix. In accounts that have a hierarchical namespace, an error will occur in cases where the name of a file appears in the middle of the prefix path. For example, you might attempt to find blobs that are named readmefile.txt by using the prefix path folder1/folder2/readme/readmefile.txt. An error will appear if any subfolder contains a file named readme.
delimiter Optional. When the request includes this parameter, the operation returns a BlobPrefix element in the response body. This element acts as a placeholder for all blobs with names that begin with the same substring, up to the appearance of the delimiter character. The delimiter can be a single character or a string.
marker Optional. A string value that identifies the portion of the list to be returned with the next list operation. The operation returns a marker value within the response body if the list returned was not complete. You can then use the marker value in a subsequent call to request the next set of list items.

The marker value is opaque to the client.
maxresults Optional. Specifies the maximum number of blobs to return, including all BlobPrefix elements. If the request doesn't specify maxresults, or specifies a value greater than 5,000, the server will return up to 5,000 items. If there are additional results to return, the service returns a continuation token in the NextMarker response element. In certain cases, the service might return fewer results than specified by maxresults, and also return a continuation token.

Setting maxresults to a value less than or equal to zero results in error response code 400 (Bad Request).
include={snapshots,metadata,uncommittedblobs,copy,deleted,tags,versions,
deletedwithversions,immutabilitypolicy,legalhold,permissions}		 Optional. Specifies one or more datasets to include in the response:

- snapshots: Specifies that snapshots should be included in the enumeration. Snapshots are listed from oldest to newest in the response.
- metadata: Specifies that blob metadata be returned in the response.
- uncommittedblobs: Specifies that blobs for which blocks have been uploaded, but which haven't been committed by using Put Block List, be included in the response.
- copy: Version 2012-02-12 and later. Specifies that metadata related to any current or previous Copy Blob operation should be included in the response.
-deleted: Version 2017-07-29 and later. Specifies that soft-deleted blobs should be included in the response.
-tags: Version 2019-12-12 and later. Specifies that user-defined, blob index tags should be included in the response.
-versions: Version 2019-12-12 and later. Specifies that versions of blobs should be included in the enumeration.
-deletedwithversions: Version 2020-10-02 and later. Specifies that deleted blobs with any versions (active or deleted) should be included in the response. Items that you've permanently deleted appear in the response until they are processed by garbage collection. Use the tag \<HasVersionsOnly\>, and the value true.
-immutabilitypolicy: Version 2020-06-12 and later. Specifies that the enumeration should include the immutability policy until date, and the immutability policy mode of the blobs.
-legalhold: Version 2020-06-12 and later. Specifies that the enumeration should include the legal hold of blobs.
-permissions: Version 2020-06-12 and later. Supported only for accounts with a hierarchical namespace enabled. If a request includes this parameter, then the owner, group, permissions, and access control list for the listed blobs or directories will be included in the enumeration.

To specify more than one of these options on the URI, you must separate each option with a URL-encoded comma ("%82").
showonly={deleted,files,directories} Optional. Specifies one of these datasets to be returned in the response:

-deleted: Optional. Version 2020-08-04 and later. Only for accounts enabled with hierarchical namespace. When a request includes this parameter, the list only contains soft-deleted blobs. Note that POSIX ACL authorization fallback is not supported for listing soft deleted blobs. If include=deleted is also specified, the request fails with Bad Request (400).
-files: Optional. Version 2020-12-06 and later. Only for accounts enabled with hierarchical namespace. When a request includes this parameter, the list only contains files.
-directories: Optional. Version 2020-12-06 and later. Only for accounts enabled with hierarchical namespace. When a request includes this parameter, the list only contains directories.
timeout Optional. The timeout parameter is expressed in seconds. For more information, see Setting timeouts for Blob Storage operations.

Request headers

The following table describes required and optional request headers.

Request header Description
Authorization Required. Specifies the authorization scheme, account name, and signature. For more information, see Authorize requests to Azure Storage.
Date or x-ms-date Required. Specifies the Coordinated Universal Time (UTC) for the request. For more information, see Authorize requests to Azure Storage.
x-ms-version Required for all authorized requests, and optional for anonymous requests. Specifies the version of the operation to use for this request. For more information, see Versioning for the Azure Storage services.
x-ms-client-request-id Optional. Provides a client-generated, opaque value with a 1-kibibyte (KiB) character limit that's recorded in the logs when logging is configured. We highly recommend that you use this header to correlate client-side activities with requests that the server receives. For more information, see Monitor Azure Blob Storage.
x-ms-upn Optional. Valid only when a hierarchical namespace is enabled for the account, and include=permissions is provided in the request. If true, the user identity values returned in the <Owner>, <Group>, and <Acl> fields are transformed from Microsoft Entra object IDs to user principal names. If false, the values are returned as Microsoft Entra object IDs. The default value is false. Note that group and application object IDs aren't translated because they don't have unique friendly names.

Request body

None.

Sample request

See Enumerating blob resources for a sample request.

Response

The response includes an HTTP status code, a set of response headers, and a response body in XML format.

Status code

A successful operation returns status code 200 (OK). For information about status codes, see Status and error codes.

Response headers

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

Response header Description
Content-Type Specifies the format in which the results are returned. Currently this value is application/xml.
x-ms-request-id This header uniquely identifies the request that was made, and can be used for troubleshooting the request. For more information, see Troubleshooting API operations.
x-ms-version Indicates the version of Blob Storage used to run the request. This header is returned for requests made by using version 2009-09-19 and later.

This header is also returned for anonymous requests, without a version specified, if the container was marked for public access by using the 2009-09-19 version of Blob Storage.
Date A UTC date/time value that indicates the time at which the response was initiated. The service generates this value.
x-ms-client-request-id You can use this header to troubleshoot requests and corresponding responses. The value of this header is equal to the value of the x-ms-client-request-id header, if it's present in the request. The value is at most 1024 visible ASCII characters. If the x-ms-client-request-id header isn't present in the request, this header won't be present in the response.

Response body

The format of the XML response is as follows.

Note that the Prefix, Marker, MaxResults, and Delimiter elements are present only if they were specified on the request URI. If NextMarker is empty, then the list results are complete. If the NextMarker is not empty, the list results may or may not be complete. If you want to list all blobs, continue to call List Blobs with subsequent marker values until NextMarker is empty.

Snapshots, blob metadata, and uncommitted blobs are included in the response only if they are specified with the include parameter on the request URI.

In version 2009-09-19 and later, the blob's properties are encapsulated within a Properties element.

Beginning with version 2009-09-19, List Blobs returns the following renamed elements in the response body:

  • Last-Modified (previously LastModified)

  • Content-Length (previously Size)

  • Content-Type (previously ContentType)

  • Content-Encoding (previously ContentEncoding)

  • Content-Language (previously ContentLanguage)

The Content-MD5 element appears for blobs created with version 2009-09-19 and later. In version 2012-02-12 and later, Blob Storage calculates the Content-MD5 value when you upload a blob by using Put Blob. Blob Storage doesn't calculate this when you create a blob by using Put Block List. You can explicitly set the Content-MD5 value when you create the blob, or by calling the Put Block List or Set Blob Properties operations.

For versions from 2009-09-19 and later, but prior to version 2015-02-21, you can't call List Blobs on a container that includes append blobs. The service returns status code 409 (Conflict) if the result of the listing contains an append blob.

LeaseState and LeaseDuration appear only in version 2012-02-12 and later.

CopyId, CopyStatus, CopySource, CopyProgress, CopyCompletionTime, and CopyStatusDescription only appear in version 2012-02-12 and later, when this operation includes the include={copy} parameter. These elements don't appear if this blob has never been the destination in a Copy Blob operation. The elements don't appear if this blob has been modified after a concluded Copy Blob operation, by using Set Blob Properties, Put Blob, or Put Block List. These elements also don't appear with a blob created by Copy Blob, before version 2012-02-12.

In version 2013-08-15 and later, the EnumerationResults element contains a ServiceEndpoint attribute that specifies the blob endpoint. This element also contains a ContainerName field that specifies the name of the container. In previous versions, these two attributes were combined together in the ContainerName field. Also in version 2013-08-15 and later, the Url element under Blob has been removed.

For version 2015-02-21 and later, List Blobs returns blobs of all types (block, page, and append blobs).

For version 2015-12-11 and later, List Blobs returns the ServerEncrypted element. This element is set to true if the blob and application metadata are completely encrypted, and false otherwise.

For version 2016-05-31 and later, List Blobs returns the IncrementalCopy element for incremental copy blobs and snapshots, with the value set to true.

For version 2017-04-17 and later, List Blobs returns the AccessTier element if an access tier has been explicitly set. For a list of allowed premium page blob tiers, see High-performance premium storage and managed disks for VMs. For Blob Storage or general-purpose v2 accounts, valid values are Hot, Cool, and Archive. If the blob is in the rehydrate pending state, then ArchiveStatus element is returned with one of the valid values (rehydrate-pending-to-hot, rehydrate-pending-to-cool, or rehydrate-pending-to-cold). For detailed information about block blob tiering see Hot, cool and archive storage tiers.

For version 2017-04-17 and later, List Blobs returns the AccessTierInferred element on Blob Storage or general-purpose v2 accounts. If the block blob doesn't have the access tier set, tier information is inferred from storage account properties, and this value is set to true. This header is present only if the tier is inferred from the account property.

For version 2017-04-17 and later, List Blobs returns the AccessTierChangeTime element on Blob Storage or general-purpose v2 accounts. This is returned only if the tier on block blob was ever set. For more information, see Representation of date-time values in headers.

For version 2017-07-29 and later, Deleted, DeletedTime, and RemainingRetentionDays appear when this operation includes the include={deleted} parameter. These elements don't appear if this blob wasn't deleted. These elements appear for blobs or snapshots that are deleted with the DELETE operation, when the soft-delete feature was enabled. The Deleted element is set to true for blobs and snapshots that are soft-deleted. Deleted-Time corresponds to the time when the blob was deleted. RemainingRetentionDays indicates the number of days after which a soft-deleted blob is permanently deleted.

For version 2017-11-09 and later, Creation-Time returns the time at which this blob was created.

For version 2019-02-02 and later, List Blobs returns the CustomerProvidedKeySha256 element if the blob is encrypted with a customer-provided key. The value will be set to the SHA-256 hash of the key used to encrypt the blob. Additionally, if the operation includes the include={metadata} parameter, and there is application metadata present on a blob encrypted with a customer-provided key, the Metadata element will have an Encrypted="true" attribute. This attribute indicates that the blob has metadata that can't be decrypted as part of the List Blobs operation. To access the metadata for these blobs, call Get Blob Properties or Get Blob Metadata with the customer-provided key.

For version 2019-02-02 and later, List Blobs returns the EncryptionScope element if the blob is encrypted with an encryption scope. The value will be set to the name of the encryption scope used to encrypt the blob. If the operation includes the include={metadata} parameter, application metadata on the blob is transparently decrypted, and available in the Metadata element.

For version 2019-12-12 and later, List Blobs returns the RehydratePriority element on Blob Storage or general-purpose v2 accounts, if the object is in the rehydrate pending state. Valid values are High and Standard.

For version 2019-12-12 and later, List Blobs returns the VersionId element for blobs and generated blob versions, when versioning is enabled on the account.

For version 2019-12-12 and later, List Blobs returns the IsCurrentVersion element for the current version of the blob. The value is set to true. This element enables you to differentiate the current version from the read-only, automatically generated versions.

For version 2019-12-12 and later, List Blobs returns the TagCount element for blobs with any tags. The Tags element appears only when this operation includes the include={tags} parameter. These elements don't appear if there are no tags on the blob.

For version 2019-12-12 and later, List Blobs returns the Sealed element for append blobs. The Sealed element appears only when the append blob has been sealed. These elements don't appear if the append blob isn't sealed.

For version 2020-02-10 and later, List Blobs returns the LastAccessTime element. The element shows when the blob's data was last accessed, according to the storage account's last access time tracking policy. The element isn't returned if the storage account doesn't have this policy, or the policy is disabled. For information about setting the account's last access time tracking policy, see the Blob Service API. The LastAccessTime element doesn't track the last time when the blob's metadata is accessed.

For version 2020-06-12 and later, List Blobs returns the ImmutabilityPolicyUntilDate and ImmutabilityPolicyMode elements, when this operation includes the include={immutabilitypolicy} parameter.

For version 2020-06-12 and later, List Blobs returns the LegalHold element, when this operation includes the include={legalhold} parameter.

For version 2020-06-12 and later, for accounts with a hierarchical namespace enabled, List Blobs returns the Owner, Group, Permissions, and Acl elements. The request must contain the include={permissions} parameter. Note that the Acl element is a combined list of access and default access control lists that were set on the file or directory.

For version 2020-06-12 and later, for accounts with a hierarchical namespace enabled, List Blobs with a delimiter returns the Properties element in the BlobPrefix element. This corresponds with the properties on the directory.

For version 2020-08-04 and later, for accounts with a hierarchical namespace enabled, List Blobs returns the DeletionId element for deleted blobs. DeletionId is an unsigned, 64-bit identifier. The element uniquely identifies a soft-deleted path, to distinguish it from other deleted blobs with the same path.

For version 2020-10-02 and later, for accounts with a hierarchical namespace enabled, List Blobs returns the ResourceType property element for the path. This can be either file or directory.

For version 2021-02-12 and later, List Blobs will percent-encode (per RFC 2396) all Blob Name or BlobPrefix Name element values. Specifically, it will do so for those values that contain characters that aren't valid in XML (U+FFFE or U+FFFF). If encoded, the Name element will include an Encoded=true attribute. Note that this only occurs for the Name element values containing the characters invalid in XML, not the remaining Name elements in the response.

For version 2021-06-08 and later, for accounts with a hierarchical namespace enabled, List Blobs returns the Placeholder properties element. It returns this element in the BlobPrefix element for placeholder directories, when listing deleted blobs with a delimiter. These placeholder directories exist to facilitate navigation to soft-deleted blobs.

For version 2021-06-08 and later, for accounts with a hierarchical namespace enabled, List Blobs returns the EncryptionContext element. If the encryption context property value is set it will return the set value.

For version 2020-02-10 and later, for accounts with a hierarchical namespace enabled, List Blobs returns the Expiry-Time element for deleted blobs. Expiry-Time is the time when the file will expire, and is returned for the file if the expiry is set on the same.

<?xml version="1.0" encoding="utf-8"?>  
<EnumerationResults ServiceEndpoint="http://myaccount.blob.core.windows.net/"  ContainerName="mycontainer">  
  <Prefix>string-value</Prefix>  
  <Marker>string-value</Marker>  
  <MaxResults>int-value</MaxResults>  
  <Delimiter>string-value</Delimiter>  
  <Blobs>  
    <Blob>  
      <Name>blob-name</Name>  
      <Snapshot>date-time-value</Snapshot>  
      <VersionId>date-time-vlue</VersionId>
      <IsCurrentVersion>true</IsCurrentVersion>
      <Deleted>true</Deleted>
      <Properties> 
        <Creation-Time>date-time-value</Creation-Time>
        <Last-Modified>date-time-value</Last-Modified>  
        <Etag>etag</Etag>
        <Owner>owner user id</Owner>
        <Group>owning group id</Group>
        <Permissions>permission string</Permissions>
        <Acl>access control list</Acl>
        <ResourceType>file | directory</ResourceType>
        <Placeholder>true</Placeholder>
        <Content-Length>size-in-bytes</Content-Length>  
        <Content-Type>blob-content-type</Content-Type>  
        <Content-Encoding />  
        <Content-Language />  
        <Content-MD5 />  
        <Cache-Control />  
        <x-ms-blob-sequence-number>sequence-number</x-ms-blob-sequence-number>  
        <BlobType>BlockBlob|PageBlob|AppendBlob</BlobType>  
        <AccessTier>tier</AccessTier>  
        <LeaseStatus>locked|unlocked</LeaseStatus>  
        <LeaseState>available | leased | expired | breaking | broken</LeaseState>  
        <LeaseDuration>infinite | fixed</LeaseDuration>  
        <CopyId>id</CopyId>  
        <CopyStatus>pending | success | aborted | failed </CopyStatus>  
        <CopySource>source url</CopySource>  
        <CopyProgress>bytes copied/bytes total</CopyProgress>  
        <CopyCompletionTime>datetime</CopyCompletionTime>  
        <CopyStatusDescription>error string</CopyStatusDescription>  
        <ServerEncrypted>true</ServerEncrypted> 
        <CustomerProvidedKeySha256>encryption-key-sha256</CustomerProvidedKeySha256>
        <EncryptionContext>encryption-context</EncryptionContext>
        <EncryptionScope>encryption-scope-name</EncryptionScope>
        <IncrementalCopy>true</IncrementalCopy>
        <AccessTierInferred>true</AccessTierInferred>
        <AccessTierChangeTime>datetime</AccessTierChangeTime>
        <DeletedTime>datetime</DeletedTime>
        <RemainingRetentionDays>no-of-days</RemainingRetentionDays>
        <TagCount>number of tags between 1 to 10</TagCount>
        <RehydratePriority>rehydrate priority</RehydratePriority>
        <Expiry-Time>date-time-value</Expiry-Time>
      </Properties>  
      <Metadata>     
        <Name>value</Name>  
      </Metadata>  
      <Tags>
          <TagSet>
              <Tag>
                  <Key>TagName</Key>
                  <Value>TagValue</Value>
              </Tag>
          </TagSet>
      </Tags>
      <OrMetadata />
    </Blob>  
    <BlobPrefix>  
      <Name>blob-prefix</Name>  
    </BlobPrefix>  
  </Blobs>  
  <NextMarker />  
</EnumerationResults>

Sample response

See Enumerating blob resources for a sample response.

Authorization

Authorization is required when calling any data access operation in Azure Storage. You can authorize the List Blobs operation as described below.

Important

Microsoft recommends using Microsoft Entra ID with managed identities to authorize requests to Azure Storage. Microsoft Entra ID provides superior security and ease of use compared to Shared Key authorization.

Azure Storage supports using Microsoft Entra ID to authorize requests to blob data. With Microsoft Entra ID, you can use Azure role-based access control (Azure RBAC) to grant permissions to a security principal. The security principal may be a user, group, application service principal, or Azure managed identity. The security principal is authenticated by Microsoft Entra ID to return an OAuth 2.0 token. The token can then be used to authorize a request against the Blob service.

To learn more about authorization using Microsoft Entra ID, see Authorize access to blobs using Microsoft Entra ID.

Permissions

Listed below are the RBAC action necessary for a Microsoft Entra user, group, managed identity, or service principal to call the List Blobs operation, and the least privileged built-in Azure RBAC role that includes this action:

If specifying include=tags:

To learn more about assigning roles using Azure RBAC, see Assign an Azure role for access to blob data.

Remarks

Blob properties in the response

If you have requested that uncommitted blobs be included in the enumeration, note that some properties aren't set until the blob is committed. Some properties might not be returned in the response.

The x-ms-blob-sequence-number element is only returned for page blobs.

The OrMetadata element is only returned for block blobs.

For page blobs, the value returned in the Content-Length element corresponds to the value of the blob's x-ms-blob-content-length header.

The Content-MD5 element appears in the response body, only if it has been set on the blob by using version 2009-09-19 or later. You can set the Content-MD5 property when the blob is created, or by calling Set Blob Properties. In version 2012-02-12 and later, Put Blob sets a block blob’s MD5 value, even when the Put Blob request doesn’t include an MD5 header.

Metadata in the response

The Metadata element is present only if the include=metadata parameter was specified on the URI. Within the Metadata element, the value of each name-value pair is listed within an element corresponding to the pair's name.

Note that metadata requested with this parameter must be stored in accordance with the naming restrictions imposed by the 2009-09-19 version of Blob Storage. Beginning with this version, all metadata names must adhere to the naming conventions for C# identifiers.

If a metadata name-value pair violates these naming restrictions, the response body indicates the problematic name within an x-ms-invalid-name element. The following XML fragment shows this:

  
…  
<Metadata>  
  <MyMetadata1>first value</MyMetadata1>  
  <MyMetadata2>second value</MyMetadata2>  
  <x-ms-invalid-name>invalid-metadata-name</x-ms-invalid-name>  
</Metadata>  
…

Tags in the response

The Tags element is present only if the include=tags parameter was specified on the URI, and if there are tags on the blob. Within the TagSet element, up to 10 Tag elements are returned, each containing the key and value of the user-defined, blob index tags. The ordering of tags isn't guaranteed in the response.

The Tags and TagCount elements aren't returned if there are no tags on the blob.

The storage service maintains strong consistency between a blob and its tags, but the secondary index is eventually consistent. Tags can be visible in a response to List Blobs before they are visible to Find Blobs by Tags operations.

Snapshots in the response

Snapshots are listed in the response only if the include=snapshots parameter was specified on the URI. Snapshots listed in the response don't include the LeaseStatus element, because snapshots can't have active leases.

Using service version 2021-06-08 and above, you can call List Blobs with a delimiter and include snapshots in the enumeration. For service versions prior to 2021-06-08, a request that includes both returns an InvalidQueryParameter error (HTTP status code 400 – Bad Request).

Uncommitted blobs in the response

Uncommitted blobs are listed in the response only if the include=uncommittedblobs parameter was specified on the URI. Uncommitted blobs listed in the response don't include any of the following elements:

  • Last-Modified

  • Etag

  • Content-Type

  • Content-Encoding

  • Content-Language

  • Content-MD5

  • Cache-Control

  • Metadata

Deleted blobs in the response

Deleted blobs are listed in the response only if the include=deleted parameter was specified on the URI. Deleted blobs listed in the response don't include the Lease elements, because deleted blobs can't have active leases.

Deleted snapshots are included in list response if include=deleted,snapshot was specified on the URI.

Object replication metadata in the response

The OrMetadata element is present when an object replication policy has been evaluated on a blob, and the List Blobs call was made by using version 2019-12-12 or later. Within the OrMetadata element, the value of each name-value pair is listed within an element corresponding to the pair's name. The format of the name is or-{policy-id}_{rule-id}, where {policy-id} is a GUID that represents the object replication policy identifier on the storage account. {rule-id} is a GUID that represents the rule identifier on the storage container. Valid values are complete or failed.

  
…  
<OrMetadata>  
  <or-e524bba7-4323-4b93-91f8-d09d5d0b7057_d86c51de-ef02-4264-bdcf-dcd389a6c7ac>complete</or-e524bba7-4323-4b93-91f8-d09d5d0b7057_d86c51de-ef02-4264-bdcf-dcd389a6c7ac>  
  <or-2b302b5d-fcd5-44d6-a5ed-455bf27e17ea_4a398ff5-2a89-4090-879b-10248f23428e>failed</or-2b302b5d-fcd5-44d6-a5ed-455bf27e17ea_4a398ff5-2a89-4090-879b-10248f23428e>  
</OrMetadata>  
…

Immutability policy in the response

The ImmutabilityPolicyUntilDate and ImmutabilityPolicyMode elements are present only if the include=immutabilitypolicy parameter was specified on the URI.

<Properties> 
   <ImmutabilityPolicyUntilDate>date-time-value</ImmutabilityPolicyUntilDate>   
   <ImmutabilityPolicyMode>unlocked | locked </ImmutabilityPolicyMode>  
</Properties>

The LegalHold element is present only if the include=legalhold parameter was specified on the URI.

<Properties> 
  <LegalHold>true | false </LegalHold>  
</Properties>

Returning result sets by using a marker value

If you specify a value for the maxresults parameter, and the number of blobs to return exceeds this value, or exceeds the default value for maxresults, the response body contains a NextMarker element. This element indicates the next blob to return on a subsequent request. In certain cases, the service might return the NextMarker element even though the number of results returned is less than the value of maxresults.

To return the next set of items, specify the value of NextMarker as the marker parameter on the URI for the subsequent request. Note that the value of NextMarker should be treated as opaque.

Using a delimiter to traverse the blob namespace

The delimiter parameter enables the caller to traverse the blob namespace by using a user-configured delimiter. In this way, you can traverse a virtual hierarchy of blobs as though it were a file system. The delimiter can be a single character or a string.

When the request includes this parameter, the operation returns a BlobPrefix element. The BlobPrefix element is returned in place of all blobs with names that begin with the same substring, up to the appearance of the delimiter character. The value of the BlobPrefix element is substring+delimiter, where substring is the common substring that begins one or more blob names, and delimiter is the value of the delimiter parameter.

You can use the value of BlobPrefix to make a subsequent call to list the blobs that begin with this prefix. You do this by specifying the value of BlobPrefix for the prefix parameter on the request URI.

Note that each BlobPrefix element returned counts toward the maximum result, just as each Blob element does.

Blobs are listed in alphabetical order in the response body, with upper-case letters listed first.

Copy errors in Copy Status Description

CopyStatusDescription contains more information about the Copy Blob failure.

  • When a copy attempt fails, CopyStatus is set to pending if Blob Storage is still retrying the operation. The CopyStatusDescription text describes the failure that might have occurred during the last copy attempt.

  • When CopyStatus is set to failed, the CopyStatusDescription text describes the error that caused the copy operation to fail.

The following table describes the fields of every CopyStatusDescription value.

Component Description
HTTP status code Standard three-digit integer specifying the failure.
Error code Keyword that describes the error. It's provided by Azure in the <ErrorCode> element. If no <ErrorCode> element appears, the service returns a keyword that contains standard error text associated with the three-digit HTTP status code in the HTTP specification. For more information, see Common REST API error codes.
Information Detailed description of the failure, in quotes.

The following table describes the CopyStatus and CopyStatusDescription values of common failure scenarios.

Important

Description text shown here can change without warning, even without a version change. Don't rely on matching this exact text.

Scenario Copy Status value Copy Status Description value
Copy operation completed successfully. success empty
User aborted the copy operation before it completed. aborted empty
A failure occurred when reading from the source blob during a copy operation. The operation will be retried. pending 502 BadGateway "Encountered a retryable error when reading the source. Will retry. Time of failure: <time>"
A failure occurred when writing to the destination blob of a copy operation. The operation will be retried. pending 500 InternalServerError "Encountered a retryable error. Will retry. Time of failure: <time>"
An unrecoverable failure occurred when reading from the source blob of a copy operation. failed 404 ResourceNotFound "Copy failed when reading the source." When the service reports this underlying error, it returns ResourceNotFound in the <ErrorCode> element. If no <ErrorCode> element appeared in the response, a standard string representation of the HTTP status, such as NotFound, appears.
The timeout period limiting all copy operations elapsed. (Currently the timeout period is two weeks.) failed 500 OperationCancelled "The copy exceeded the maximum allowed time."
The copy operation failed too often when reading from the source, and didn’t meet a minimum ratio of attempts to successes. (This timeout prevents retrying a very poor source over two weeks before failing). failed 500 OperationCancelled "The copy failed when reading the source."

Billing

Pricing requests can originate from clients that use Blob Storage APIs, either directly through the Blob Storage REST API, or from an Azure Storage client library. These requests accrue charges per transaction. The type of transaction affects how the account is charged. For example, read transactions accrue to a different billing category than write transactions. The following table shows the billing category for List Blobs requests based on the storage account type:

Operation Storage account type Billing category
List Blobs Premium block blob
Standard general-purpose v2
Standard general-purpose v1		 List and Create Container operations

To learn about pricing for the specified billing category, see Azure Blob Storage Pricing.

See also

Status and error codes
Blob Storage error codes