Any reason not to use USE_ETAGS with CommonMiddleware in Django?

Posted by allyourcode on Stack Overflow See other posts from Stack Overflow or by allyourcode
Published on 2010-05-02T00:34:58Z Indexed on 2010/05/02 0:37 UTC
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The only reason I can think of is that calculating ETag's might be expensive. If pages change very quickly, the browser's cache is likely to be invalidated by the ETag. In that case, calculating the ETag would be a waste of time. On the other hand, a giving a 304 response when possible minimizes the amount of time spent in transmission. What are some good guidelines for when ETag's are likely to be a net winner when implemented with Django's CommonMiddleware?

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