CppCMS
sessions/config.js Configuration File
{
        "service" : {
                "api" : "http",
                "port" : 8080
        },
        "http" : {
                "script" : "/hello"
        },
        "session" : {
                "expire" : "renew",
                "timeout" : 604800,
                "location" : "client",
                "client" :      {
                        "hmac" :        "sha1",
                        "hmac_key" :    "3891bbf7f845fd4277008a63d72640fc13bb9a31"
                }

        },
}