UA伪装  <---------->UA检测：门户网站会检测对应请求的载体身份标识，如果是浏览器那就认为是正常用户

headers

爬虫之参数合集 headers_xml爬虫之参数合集 headers_html_02

headers = {
            'Accept-Encoding': 'gzip, deflate, sdch',
            'Accept-Language': 'en-US,en;q=0.8',
            'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.95 Safari/537.36',
            'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8',
            'Referer': 'http://www.baidu.com/',
            'Connection': 'keep-alive',
        }

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