Shibboleth Developers

[Chad La Joie <>]

Thanks Kaspar.  See, I told you I wasn't an HTTP expert.  ;)

Kaspar Brand wrote:
>> So, my general question is, should I be checking the Etag or the
>> Last-Modified header in order to detect changes?
> 
> If the server provides an ETag header in his response, then you should
> (or MUST, as per RFC 2616, actually) use that one:
> 
>>    HTTP/1.1 clients:
>>
>>       - If an entity tag has been provided by the origin server, MUST
>>         use that entity tag in any cache-conditional request (using If-
>>         Match or If-None-Match).
> 
> Otherwise you should use If-Modified-Since (provided that the server's
> response had a Last-Modified field).
> 
> Setting both If-Match/If-None-Match and If-Modified-Since in a request
> has an "undefined" result according to the spec.
> 
> Kaspar

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