[wget-notify] [bug #20329] Make HTTP timestamping use If-Modified-Since

[Micah Cowan]

Follow-up Comment #2, bug #20329 (project wget):

vinocit points out that if the remote end will still send the full content
even if it hasn't been modified since the timestamp, if the server doesn't
grok the If-Modified-Since header (implements HTTP/1.0). The only reliable way
to avoid this is to first determine the server's version (or, have it cached
somewhere). That'd mean (a) waiting on this until we have proper HTTP/1.1
support, and (b) relying on the current HEAD-then-GET mechanism until we've
gotten our first response back from the server, complete with version info.

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