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Why HTTP to fetch the record
Plenty of HTTP servers
HTTPS
Easy implementation as file or CGI
HTTP Caches and expiry control
Domain can completely hide policy in CGI
Hidden delegation and referrals
Real time forgery detection in CGI
Any format: Lines, ASN.1, XML,…
Can use full sender e-mail address
MessID/Recipient/Subject/Date/… as params

PPT Version