2.2.2.4 Content
When a client or server sends session data, the session data is contained in a message body. The message body contains one or more 8-bit sequences representing the session data.
A state server implementation MUST treat content as opaque and MUST round-trip the value back to the client when requested.
Both the client and server MUST send and receive content as byte arrays (char* or byte[]).
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content = *OCTET