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ETags and Optimistic Concurrency

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joshgav edited this page Oct 23, 2014 · 1 revision

The O365 Files Service uses ETags (short for Entity Tags, link to HTTP/1.1 RFC 2616 here) to provide optimistic concurrency control. To update or delete a file, you must supply the current ETag of the file in a If-Match header, or specify If-Match: * to overwrite no matter what.

Do not add If-Match: * to new files, as the * implies that something exists.

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