The HttpRuntime object initializes a number of internal objects that will help carry the request out.
HttpRuntime对象初始化大量内部对象用于处理请求输出。
Step 3: the newly created application domain creates hosting environment, i.e. the 'HttpRuntime' object.
step 3：新建的应用程序域创建宿主环境，如HttpRuntime对象。
The HttpRuntime creates the context for the request and fills it up with any HTTP information specific to the request.
HttpRuntime对象为请求创建上下文，将请求用到的各种HTTP信息填充在上下文中。
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