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��YZdej fd��YZ!dS(s�Networked spam-signature detection server.

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HTTP-style response code, and a "Diag" header, which is a human-readable
message explaining the response code (typically this will be "OK").

Both the request and response headers always include a "PV" header, which
indicates the protocol version that is being used (in a major.minor format).
Both the requestion and response headers also always include a "Thread",
which uniquely identifies the request (this is a requirement of using UDP).
Responses to requests may arrive in any order, but the "Thread" header of
a response will always match the "Thread" header of the appropriate request.

Authenticated requests must also have "User", "Time" (timestamp), and "Sig"
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