服务网关模式还能提供指导，告诉您如何使服务调用强制执行安全性。
The service gateway pattern also provides guidance on how to enforce security on service invocations.
如果在强制模式下运行 SELinux，还应当运行 /usr/lib/cups/filter 目录中的 restorecon 来更新安全上下文。
If you are running SELinux in enforcing mode, you should also run restorecon in the /usr/lib/cups/filter directory to update the security contexts.
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