ETag Best Practices

[John Yeary]

Hello All,

I am trying to come up with some best practices for using ETag. I have been
using a hex conversion of the string and slicing off the first 13 digits,
and a MD5 hash of the the fields. The MD5 hash though seems a little
overkill. I thought about using a CRC32, or Adler hash.

The MD5 hash seems to collide with the HTTP 1.1 specification
Content-MD5[1] header which contains an MD5 hash of the entity.

I did a lot of searching on Google and found a number of different ideas,
but the majority had a hex hash of some sort. Can anyone share their ideas
and code?

Thanks,

John


[1] http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.15
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