处理请求的方法（Request Handling Methods） 由于HTTP/1.0没有定义PUT, DELETE, OPTIONS 和TRACE方法，因此，只支持HTTP/1.0的容器，只会使用servlet的doGet, doHead和doPos...
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The SolrRequestHandler interface defines the methods necessary to implement custom request handling.
SolrRequestHandler接口定义了实现定制请求处理所需的方法。
Request handling (processAction and render methods)
处理请求（processAction 和 render 方法）
The request cycle processor is responsible for handling instructions during the request cycle. It's used by RequestCycle, which calls its methods in the predefined order.
请求周期处理器负责处理请求周期内的指令。
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