I think what you get may depend on what version of BusyBox you are
using. I check 3 different versions I happen to have. v1.24.0.git shows
only "-s|--spider" and seems to give no output except its return code.
v1.27.2 shows "--spider" as well as "-S|--server-response."
Using v1.27.2,
busybox wget -S --spider http://example.com/ 2>&1 | busybox awk
'/Content-Length/{print $2}'
yields 1256, which is what I think you want. I've never used sed that
much but awk is a tool I use a lot; that's why I rewrote the one-liner
that way. You may have to get a newer version of BusyBox.
Doug Clapp
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