Suggest a cloud database solution for downloading large binary file using REST API

Question

There are seem to have many cloud data storage solutions in Azure. Our requirement is to let our 10,000+ smart devices to download firmware that is around 50kB. The device has older Linux distribution in ARM and might not be able to support ready-made client-side library. But we definitely are able to access remote RESTful services. Since our device can interrupt the download from time to time, we need a cloud data storage that supports pausing/resuming feature. Wondering if Cosmos DB / Document DB / Blob storage can serve the purpose? Assuming our client can implement a paging feature that remembers the position of the downloading file. We will need the cloud can take the position as an argument and resuming the download.

Thank you!

Answer 1

@txh3157
I believe Blob storage might be suitable for your use case. According to the reference of Azure REST API Get Blob for Storage Service, there is a parameter x-ms-range of request headers for downloading part of a Blob.

x-ms-range Optional. Return only the bytes of the blob in the specified range. If both Range and x-ms-range are specified, the service uses the value of x-ms-range. If neither are specified, the entire blob contents are returned. See Specifying the Range Header for Blob Service Operations for more information.

So you can resume the downloading process by pass the x-ms-range value with bytes=<the byte size of your downloaded>- to continue to download the full tail of a blob in a working thread.

Hope this helps! Please let us know if you have further questions or issues.

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