string(353) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%A4%A7%E6%95%B0%E6%8D%AE%E6%94%B6%E9%9B%86%E6%97%B6%2C%E5%BA%94%E5%B0%BD%E5%8F%AF%E8%83%BD%E6%94%B6%E9%9B%86%E5%85%A8%E9%83%A8%E7%9A%84%E6%95%B0%E6%8D%AE%2C%E8%80%8C%E4%B8%8D%E6%98%AF%E6%A0%B7%E6%9C%AC => Received HTTP code 403 from proxy after CONNECT"
大数据收集时,应尽可能收集全部的数据,而不是样本
