Thanks Marcelo,

>  In HTTP 1.1 range has the form "[lower]-[upper]", so "[lower]-" is
>  valid.  I'm not sure what range= takes, you get to try it :-)

I found that its "Range: bytes=10000-", something like this. I wonder if 
I can use this header to download the same file from different mirrors 
i.e. have several
req = Net::HTTP::Get.new(path)
but with  different ranges and write them to the same file with random 
access. Would it be a right technique for this idea?

Thanks Alex

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