google app engine - Does it cost anything to list gs://? -

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if example run scandir on google cloud storage bucket folder on app engine application, billed?

i know costs connect bucket via json , xml api, cannot find info gs://.

if costs anything, scandir count 1 class operation?

if @ the pricing page, storage.buckets.list (listing buckets within project) , storage.objects.list (listing objects within bucket) both class operations, which, of today (july 16th, 2015) cost $0.01 per 1000 operations.


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