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The Blobstore API allows your app to serve data objects, called blobs, that are much larger than the size allowed for objects in the Datastore service. Blobs are created by uploading a file through an HTTP request. Typically, your apps will do this by presenting a form with a file upload field to the user. When the form is submitted, the Blobstore creates a blob from the file's contents and returns an opaque reference to the blob, called a blob key, which you can later use to serve the blob.
The Blobstore service is currently released as an experimental feature. This means the API and behavior of the service may change in ways that are not compatible with earlier releases, even for minor releases of the runtime environments. Please try out this feature and let us know what you think! (more info)
You must have billing enabled in order to use the Blobstore API in apps you deploy to the App Engine environment. When your app is running locally in the development server, you can use the Blobstore API freely.
This reference describes the Python API for the Blobstore service. It has the following sections:
