我正在尝试使用Python中的Requests库抓取网站，当我尝试：
r = requests.get('http://www.cell.com/cell-stem-cell/home', allow_redirects = False)
>>> r.status_code
302
>>> r.text
'The URL has moved <a href="https://secure.jbs.elsevierhealth.com/action/getSharedSiteSession?redirect=http%3A%2F%2Fwww.cell.com%2Fcell-stem-cell%2Fhome&rc=0&code=cell-site">here</a>\n'
当我尝试时：
>>> r = requests.get("https://secure.jbs.elsevierhealth.com/action/getSharedSiteSession?redirect=http%3A%2F%2Fwww.cell.com%2Fcell-stem-cell%2Fhome&rc=0&code=cell-site")
>>>
>>> r.text
'\n\n\n\n\n<style type="text/css">\n .hidden {\n display: none;\n visibility: hidden;\n }\n</style>\n\n<!-- hidden iFrame for each of the SSO URLs -->\n<div class="hidden">\n \n <iframe src="//acw.secure.jbs.elsevierhealth.com/SSOCore/update?utt=81c120bb854495181ef4ef3f679b12261e956c5-JKh">Your browser doesn\'t support iFrames!</iframe>\n \n <iframe src="//acw.sciencedirect.com/SSOCore/update?utt=81c120bb854495181ef4ef3f679b12261e956c5-JKh">Your browser doesn\'t support iFrames!</iframe>\n \n <iframe src="//acw.scopus.com/SSOCore/update?utt=81c120bb854495181ef4ef3f679b12261e956c5-JKh">Your browser doesn\'t support iFrames!</iframe>\n \n <iframe src="//acw.sciverse.com/SSOCore/update?utt=81c120bb854495181ef4ef3f679b12261e956c5-JKh">Your browser doesn\'t support iFrames!</iframe>\n \n <iframe src="//acw.mendeley.com/SSOCore/update?utt=81c120bb854495181ef4ef3f679b12261e956c5-JKh">Your browser doesn\'t support iFrames!</iframe>\n \n <iframe src="//acw.elsevier.com/SSOCore/update?utt=81c120bb854495181ef4ef3f679b12261e956c5-JKh">Your browser doesn\'t support iFrames!</iframe>\n \n</div>\n\n\n\n<noscript>\n <a href="CANT POST LINK BECAUSE OF LACK OF REPUTATION POINTS OF STACK OVERFLOW">Redirect</a>\n</noscript>\n\n<!-- redirect to the product page after all iFrames are rendered -->\n<script>\n setTimeout(redirectFun,2000);\n var iFramesList = document.getElementsByTagName("iframe");\n var renderedIFramesCount = 0;\n var numberOfIFrames = iFramesList.length;\n for (var i = 0; i < iFramesList.length; i++) {\n var iFrame = iFramesList[i];\n bindEvent(iFrame, \'load\', function(){\n renderedIFramesCount = renderedIFramesCount + 1;\n if (renderedIFramesCount >= numberOfIFrames)\n {\n redirectFun();\n }\n });\n }\n var doRedirect = true;\n function redirectFun() {\n if (doRedirect)\n window.location.href = "CANT POST THIS WEBSITE BECAUSE OF MY REPUTATION POINTS ON STACKOVERFLOW";\n doRedirect = false;\n }\n\n function bindEvent(el, eventName, eventHandler) {\n if (el.addEventListener){\n el.addEventListener(eventName, eventHandler, false);\n } else if (el.attachEvent){\n el.attachEvent(eventName, eventHandler);\n }\n }\n</script>\n\n'
我只想获取原始网站的HTML。
答案 0 :(得分：1)
您必须沿请求标头发送User-agent，以使网站相信该请求来自真实的Web浏览器。因此，如果您想要非重定向网址的内容，则您的代码应为
from requests import get
content = get('http://www.cell.com/cell-stem-cell/home', headers = {'User-agent': 'Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36
(KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.36'},allow_redirects = False).content
print content
输出将是：
The URL has moved <a href="https://secure.jbs.elsevierhealth.com/action/getShar
edSiteSession?redirect=http%3A%2F%2Fwww.cell.com%2Fcell-stem-cell%2Fhome&rc=0&co
de=cell-site">here</a>
如果您想要重定向网址的内容，则允许重定向，但包含用户代理标头。此方法适用于大多数不在其网站上使用动态内容的网站。如果您要从动态内容网站抓取数据，则必须使用selinium等网络浏览器模拟器。
答案 1 :(得分：0)
你只需要很少的工作来直接得到它。需要重定向时，服务器发送Location标头。您只需要访问该位置标题中的URL。
r1.content您将在r1.text或def published_comment
html = "<li>
<div id='comment_#{@comment.anchor}' class='comment #{@comment.state}' data-comment-id='#{@comment.to_param}'>
<div>
#{ avatar }
#{ userbar }
<div class='cbody'>#{ @comment.content }</div>
#{ reply }
"
html << approved_comment if controller.try(:current_user).try(:admin?)
html << "</div>
</div>
<div class='form_holder'></div>
#{ children }
</li>"
html
end