Working with the root container

مقالة
06/27/2023

A root container serves as a default container for your storage account. A storage account may have one root container. The root container must be explicitly created and must be named $root.

A blob stored in the root container may be addressed without referencing the root container name, so that a blob can be addressed at the top level of the storage account hierarchy. For example, you can reference a blob that resides in the root container in the following manner:

https://myaccount.blob.core.windows.net/mywebpage.html

Managing the Root Container

To use the root container with your storage account, create a new container named $root. The following sample request shows how to create the root container:

Request Syntax:  
PUT https://myaccount.blob.core.windows.net/$root?restype=container HTTP/1.1  
  
Request Headers:  
x-ms-version: 2011-08-18  
x-ms-date: Sun, 25 Sep 2011 22:50:32 GMT  
x-ms-meta-Name: StorageSample  
x-ms-blob-public-access: container  
Authorization: SharedKey myaccount:Z5043vY9MesKNh0PNtksNc9nbXSSqGHueE00JdjidOQ=

You can also delete the root container if you no longer have a need for it.

Like other containers, the root container can be made available for anonymous public access. You can make the container public by setting the x-ms-blob-public-access header when the container is created, or by calling Set Container ACL after it already exists. See Restrict Access to Containers and Blobs for more information.

If the root container is present, it will appear when you perform the List Containers operation against the storage account.

When you perform a List Blobs operation against the root container, the root container does not appear in the resource URLs for the blobs returned. The following request syntax shows how to call List Blobs against the root container:

GET https://myaccount.blob.core.windows.net/$root?restype=container&comp=list HTTP/1.1

Important

A blob in the root container cannot include a forward slash (/) in its name.

Examples

The following examples show how to work with container and blob resources, including the root container:

GET Operations

To list the containers in a storage account:

GET https://myaccount.blob.core.windows.net/?comp=list

To get a container's properties:

GET/HEAD https://myaccount.blob.core.windows.net/mycontainer?restype=container

To list the blobs in a container named mycontainer:

GET https://myaccount.blob.core.windows.net/mycontainer?restype=container&comp=list

To list the blobs in the root container:

GET https://myaccount.blob.core.windows.net/$root?restype=container&comp=list

To read a blob named myfile from a container named mycontainer:

GET https://myaccount.blob.core.windows.net/mycontainer/myfile

To read a blob named myphoto from the root container:

GET https://myaccount.blob.core.windows.net/myphoto

You can also explicitly reference the root container:

GET https://myaccount.blob.core.windows.net/$root/myphoto

To read blob metadata on a blob in the root container:

GET https://myaccount.blob.core.windows.net/myphoto?comp=metadata

You can also explicitly reference the root container:

GET https://myaccount.blob.core.windows.net/$root/myphoto?comp=metadata

Note

Be careful to avoid including a trailing forward slash (/) when referencing a blob under the root container. For example, a URL such as the following now results in status code 400 (Bad Request):

https://myaccount.blob.core.windows.net/myblob/

In the above example, the Blob service reads the container name as myblob and expects to see a blob name after the trailing slash. The request is malformed due to the missing blob name.

The following URL is valid for an operation on a blob in the root container:

https://myaccount.blob.core.windows.net/myblob

PUT Operations

To create a container named mycontainer:

  
PUT https://myaccount.blob.core.windows.net/mycontainer?restype=container

To create a blob named myblob in the root container:

  
PUT https://myaccount.blob.core.windows.net/myblob

You can also explicitly specify the root container:

  
PUT https://myaccount.blob.core.windows.net/$root/myblob

To create a blob named myblob in a container named mycontainer:

PUT https://myaccount.blob.core.windows.net/mycontainer/myblob

To create a blob named photos/myphoto in a container named mycontainer:

PUT https://myaccount.blob.core.windows.net/mycontainer/photos/myphoto

To set metadata on a blob named myblob in the root container:

  
PUT https://myaccount.blob.core.windows.net/myblob?comp=metadata

DELETE Operations

To delete a container named mycontainer:

  
DELETE https://myaccount.blob.core.windows.net/mycontainer?restype=container

To delete the root container:

  
DELETE https://myaccount.blob.core.windows.net/$root?restype=container

To delete the blob myblob from the root container:

  
DELETE https://myaccount.blob.core.windows.net/myblob