hello all
If-Modified-Since" and "Last-Modified" HTTP headers are great for reducing your total bandwidth costs too, especially if you get a lot of repeat visits. The "Expires" header is another good one if you know when the page will be updated next, or conversely if you know when your page won't be updated (e.g. not for at least 24 hours).
Can be really tricky to debug though - "wget -S --spider" is really useful for that.
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