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为啥curl或file_get_contents采集url时k数过高则不能获取

WBOY
Release： 2016-06-13 12:38:43
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为何curl或file_get_contents采集url时k数过高则不能获取？
之前通过http://bbs.csdn.net/topics/390572750得知了获取方式，但有的链接如下：
http://www.autohome.com.cn/77/options.html
http://www.autohome.com.cn/59/options.html
都可正常获取
但以下链接：
http://www.autohome.com.cn/146/options.html
http://www.autohome.com.cn/317/options.html
则获取为空，不知道是何原因，目前个人看是能获取的页面K数要小于不能获取的页
求各位高手帮忙，看是什么问题？  小弟用的是lnmp

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