18 动态变量：uuid 时间戳及随机数
动态变量---posmtan提供了可以在请求中使用的动态变量
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{{$guid}} : A v4-style GUID
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{{$timestamp}}: The current Unix timestamp in seconds
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{{$randomInt}}: A random integer between 0 and 1000
{{$guid}} : A v4-style GUID
{{$timestamp}}: The current Unix timestamp in seconds
{{$randomInt}}: A random integer between 0 and 1000
