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E.g. naming your JavaScript as foo-e65325060020bef3804f867dd6bae598.js, where e65325060020bef3804f867dd6bae598 is a hash of the content of the file.

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This is fingerprinting:

It allows you to send a link to a different file-name when a peripheral asset file (javascript, css or image files) changes on the main webpage. The change in file-name causes the browser to re-download any assets which have been changed.

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