In this step, we are going to develop one custom service named HttpLogService to implement the logging facility.
在该步骤中，我们将要开发一个定制服务，命名为HttpLogService，来进行日志记录。
Because a FunctionCall class can contain more than one custom function, you should define a unique identification number for each custom function.
因为functioncall类可以包含一个以上的定制函数，所以应当为每个定制函数定义惟一的识别号。
Users should understand the cause and the resolution of metatype conflicts. This becomes essential when you want to use more than one custom metaclass.
用户应该理解元类型冲突的原因和解决方案，当您想使用多个定制的元类时，这将非常必要。
Using the output of one custom tag as the input for another increases the tags' reusability.
将一个定制标记的输出作为另一个定制标记的输入增加了标记的可重用性。
Using the output of one custom tag as the input for another increases the tags' reusability.
将一个定制标记的输出作为另一个定制标记的输入增加了标记的可重用性。
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