Although Google Docs documents seem to have a unique ID in the URL, I’m wondering if there is a way to get a hash (MD5, SHA1) of a document without downloading it again. Has anyone attempted something similar? Is there some API call I can make?
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For files stored on Google Docs, an md5 checksum is provided in the document list entry:
For Google Docs document, you can use the “Etag” element to check for changes.