For certain types of exploits, this is crucial, as you can stop a user from sending inappropriate input and causing an unexpected result.
对于特定类型的使用，这是至关重要的，因为您可以阻止用户发送不适当的输入并导致异常结果。
This can result in unexpected additional memory usage, causing memory-area limits to be exceeded.
这可能导致意外的附加内存使用，导致内存使用超出内存区域限制。
As the PUT operation is idempotent, it can be retried if the result is unclear without causing unwanted effects (in this case, submitting the same order twice).
由于PUT操作具有幂等性，因而如果结果不清可以进行重试，且不会有副作用(此情形相当于提交同一订单2次)。
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