google app engine - How can I upload to BlobStore from a url in java -

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how can upload file programmatically url blobstore?

for instance, when using facebook login, app gets url of profile picture, , fetch , upload blobstore. examples in https://cloud.google.com/appengine/docs/java/blobstore/#java_uploading_a_blob not help, app knows url, don't want involve user in uploads.

you have use google cloud storage storing such files.

see appengine examples @ https://cloud.google.com/appengine/docs/java/googlecloudstorageclient/getstarted


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