服务模型允许使用者为指定的合约类型定义多个用户端。

The service model allows the user to define multiple clients for a given contract type.

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但是，虽然在用户端执行档案名称检查很好用，却不能保证使用者无法上载不安全的档案类型，例如可执行档。

However, although performing a client-side check of the file name can be useful, it does not guarantee that users cannot upload an unsafe file type, such as an executable file.

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