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how can I check the size of file on server in bytes?

i need to do it for following

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Has already been answered : stackoverflow.com/questions/3518968/… – Nifle Aug 19 '10 at 6:59
yes one on SO is sovled. but I want to know how to check the file size to use it. – user46722 Aug 19 '10 at 7:10
Ahh... OK, I misread the question – Nifle Aug 19 '10 at 7:44
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Perform a HEAD request and check out the Content-Length http header. With curl that would be curl -I http://yoururl.com/yourfile.jpg

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