on the technical side of things, header referer is normally sent by your web browser based on your previous web location (url in the address bar typically).
I assume this is how its works on k2s so you need to find this information yourself. the uploader/owner of the file can set where users need to come from to obtain access to file or gain faster download speeds. Since you need to know where the file was originally posted you need to place this information in (static). The problem is some people repost.
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