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Microsoft Windows Azure Development Cookbook by Neil Mackenzie

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Setting properties and metadata for a blob

The Windows Azure Blob Service allows metadata and properties to be associated with a blob. The metadata comprises a sequence of developer-defined, name-value pairs. The properties comprise HTTP request headers including: Cache-Control, Content-Encoding, Content-MD5, and Content-Type. The Blob service also supports metadata and properties for blob containers. Requesting a download of the blob attributes—its metadata and properties—is an efficient way of checking blob existence as only a small amount of data is downloaded.

The Blob service uses the Content-MD5 property to validate blob upload. When specified, the Content-MD5 property must be set to the base64-encoded value of the MD5 hash of the blob data. ...

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