http - Is If-Modified-Since strong or weak validation? -

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http 1.1 states there can either strong , weak etag/if-none-match validation. questions is, last-modified/if-modified-since validation strong or weak?

this has implications whether sub-range requests can made or not.

from http://greenbytes.de/tech/webdav/draft-ietf-httpbis-p5-range-23.html#rfc.section.4.3:

"a response might transfer subrange of representation if connection closed prematurely or if request used 1 or more range specifications. after several such transfers, client might have received several ranges of same representation. these ranges can safely combined if have in common same strong validator, "strong validator" defined either entity-tag not marked weak (section 2.3 of [part4]) or, if no entity-tag provided, last-modified value strong in sense defined section 2.2.2 of [part4]."


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