Create File

The Create File operation creates a new file or replaces a file. Note that calling Create File only initializes the file. To add content to a file, call the Put Range operation.


The Create File request may be constructed as follows. HTTPS is recommended.

Method Request URI HTTP Version

Replace the path components shown in the request URI with your own, as follows:

Path Component Description
myaccount The name of your storage account.
myshare The name of your file share.
mydirectorypath Optional. The path to the directory where the file is to be created. If the directory path is omitted, the file will be created within the specified share.

If specified, the directory must already exist within the share before the file can be created.
myfile The name of the file to create.

For details on path naming restrictions, see Naming and Referencing Shares, Directories, Files, and Metadata.

URI Parameters

The following additional parameters may be specified on the request URI.

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

Request Headers

The following table describes required and optional request headers.

Request Header Description
Authorization Required. Specifies the authentication scheme, account name, and signature. For more information, see Authentication for the Azure Storage Services.
Date or x-ms-date Required. Specifies the Coordinated Universal Time (UTC) time for the request. For more information, see Authentication for the Azure Storage Services.
x-ms-version Required for all authenticated requests. Specifies the version of the operation to use for this request. For more information, see Versioning for the Azure Storage Services.
Content-Length Optional. Must be zero if present.
x-ms-content-length: byte value Required. This header specifies the maximum size for the file, up to 1 TiB.
Content-Type | x-ms-content-type Optional. The MIME content type of the file. The default type is application/octet-stream.
Content-Encoding | x-ms-content-encoding Optional. Specifies which content encodings have been applied to the file. This value is returned to the client when the Get File operation is performed on the file resource and can be used to decode file content.
Content-Language | x-ms-content-language Optional. Specifies the natural languages used by this resource.
Cache-Control | x-ms-cache-control Optional. The File service stores this value but does not use or modify it.
x-ms-content-md5 Optional. Sets the file's MD5 hash.
x-ms-content-disposition Optional. Sets the file’s Content-Disposition header.
x-ms-type: file Required. Set this header to file.
x-ms-meta-name:value Optional. Name-value pairs associated with the file as metadata. Metadata names must adhere to the naming rules for C# identifiers.

Note that file metadata specified via the File service is not accessible from an SMB client.

Request Body


Sample Request

Request Syntax:  
PUT HTTP/1.1  
Request Headers:  
x-ms-version: 2014-02-14  
x-ms-date: Mon, 27 Jan 2014 22:41:55 GMT  
Content-Type: text/plain; charset=UTF-8  
x-ms-content-length: 1024  
Authorization: SharedKey myaccount:YhuFJjN4fAR8/AmBrqBz7MG2uFinQ4rkh4dscbj598g=  


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
ETag The ETag contains a value which represents the version of the file, in quotes.
Last-Modified Returns the date and time the share was last modified. The date format follows RFC 1123. For more information, see Representation of Date-Time Values in Headers.

Any operation that modifies the directory or its properties updates the last modified time. Operations on files do not affect the last modified time of the directory.
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 the File service used to execute the request.
Date A UTC date/time value generated by the service that indicates the time at which the response was initiated.
x-ms-request-server-encrypted: true/false Version 2017-04-17 or newer. The value of this header is set to true if the contents of the request are successfully encrypted using the specified algorithm, and false otherwise.

Response Body


Sample Response

Response Status:  
HTTP/1.1 201 Created  
Response Headers:  
Transfer-Encoding: chunked  
Date: Mon, 27 Jan 2014 23:00:12 GMT  
ETag: "0x8CB14C3E29B7E82"  
Last-Modified: Mon, 27 Jan 2014 23:00:06 GMT  
x-ms-version: 2014-02-14  
Server: Windows-Azure-File/1.0 Microsoft-HTTPAPI/2.0  


Only the account owner may call this operation.


To create a new file, first initialize the file by calling Create File and specify its maximum size, up to 1 TiB. When performing this operation, do not include content in the request body. Once the file has been created, call Put Range to add content to the file or to modify it.

You can change the size of the file by calling Set File Properties.

If the share or parent directory does not exist, then the operation fails with status code 412 (Precondition Failed).

Note that the file properties cache-control, content-type, content-md5, content-encoding and content-language are discrete from the file system properties available to SMB clients. SMB clients are not able to read, write or modify these property values.

Create File is not supported on a share snapshot, which is a read-only copy of a share. An attempt to perform this operation on a share snapshot will fail with 400 (InvalidQueryParameterValue)

See Also

Operations on Files