This will establish an encrypted session without any modifications needed on the client side.
这将建立一个加密的会话，而不需要在客户端做任何修改。
On the client side, you can control the client's (PSQL) default behavior for using an encrypted session or not by defining the environment variable PGSSLMODE.
在客户机端，可以通过定义环境变量pgsslmode来控制客户机(psql)的默认行为：是否使用加密的会话。
They normally maintain large session data at the client side, which improves performance.
它们通常在客户端维护大量会话数据，这有助于提高性能。
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