How does Facebook saves images to my HDD

Question

How Facebook downloads images, when you click "Download" near the picture? I see, that they are passing some argument:

_n.jpg?dl=1

,but how it is managed 'behind the scenes'?

danlefree · Answer 1 · 2011-08-31 00:07:33Z

up vote 4 down vote

When the dl GET variable is set, Facebook's servers add the Content-Disposition: attachment header.

See RFC 2616 for details on the Content-Disposition header.

answered Aug 31 '11 at 0:07

danlefree♦
9,7131826

	so when I request facebook.com/XXX_n.jpg, it is not picture, but site with extension .jpg? Or it can be done some other way? – Maciekp Aug 31 '11 at 7:14
	@Maciekp In each case your browser is being provided with the same JPG image - the `Content-Disposition` header simply tells your web browser to download it instead of display it inline. – Jacob Hume Aug 31 '11 at 17:43

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