If the request block is requesting HTML, it executes the first closure; if it's requesting XML, it executes the second.
如果发出请求的代码块是在请求HTML，这段代码会执行第一个闭包；如果发出请求的代码块在请求XML，这段代码会执行第二个闭包。
If the request block is requesting HTML, it executes the first closure; if it's requesting XML, it executes the second.
如果发出请求的代码块是在请求HTML，这段代码会执行第一个闭包；如果发出请求的代码块在请求XML，这段代码会执行第二个闭包。
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