With some tweaking the following will work:
client.srv.com has the file listings, makes an MD5 of the filename
plus a salt (random string, lets call it 123456) and writes the MD5 to
the disk of client.srv.com as /<filename>-123456.txt - then makes a
request to dload.srv.com as /dl.php/<filename>/salt
dload.srv.com/dl.php makes a request for the contents of
client.srv.com/<filename>-salt.txt and checks that the MD5 of
<filename> and salt match what was returned, if so serve the requested
file through php with the correct header('Content-...') details.
Use a cron job on client.srv.com to clear out the tmp files.
-Tig
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