header——检索命名的请求标头。
门户Servlet检查请求标头并确定哪个设备和用户正在请求页面。
The portal servlet examines the request header and determines which device and which user is requesting a page.
User-Agent 请求标头字段包含有关发出该请求的用户代理的信息。
The User-Agent request-header field contains information about the user agent originating the request.
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