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Both object_post_as_copy true and false settings are supported by the API so other than the mentioned exceptions POSTs will act as expected. As to why this this setting is needed it has to do with how swift stores its object metadata in the files on disk in conjunction with the metadata stored in the container servers. POST performance is not typically a large concern in swift clusters so the default is set for keeping content-type in sync and the having the ability to use container-sync.