How often are etags used these days and what is their maximum length?

Posted by Rhubarb on Stack Overflow See other posts from Stack Overflow or by Rhubarb
Published on 2010-06-03T01:48:15Z Indexed on 2010/06/03 1:54 UTC
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http

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rss

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http-status-codes

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http-status-code-304

Curious to know how common it is for web servers to use etags, especially with RSS feeds? Also I can't seem to find what the maximum length can be for the etag header. The HTTP spec fails to mention it, at least the part that I was reading.

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