It simply creates a SOAP envelope with an empty body.
它只是简单地创建了一个SOAP信封，而没有包括任何消息体。
Server examines the ETag and determines that the page hasn't changed since last time the client requested it, so sends back a response of 304 (Not Modified) with an empty body.
服务器检查该ETag，并判断出该页面自上次客户端请求之后还未被修改，直接返回响应304(未修改——NotModified)和一个空的响应体。
Server examines the ETag and determines that the page hasn't changed since last time the client requested it, so sends back a response of 304 (Not Modified) with an empty body.
服务器检查该ETag，并判断出该页面自上次客户端请求之后还未被修改，直接返回响应304(未修改——NotModified)和一个空的响应体。
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