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当有人点击搜索结果链接时，Google 会设置一个 HTTP Referrer。此referrer 与URL 地址栏中显示的地址不同（例如，它包含GET 参数cd，表示被点击链接的搜索结果位置）。

似乎这是用javascript完成的。我想在我的网站上做类似的事情，所以我很想知道这个“引荐来源操纵”究竟是如何用 javascript 完成的。

有任何想法吗？

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当您单击其结果链接时，Google 会通过其自己的点击代理重定向您 - 代理的地址就是您在Referer.

示例：我访问http://www.google.cz并搜索“当有人点击搜索结果链接时，Google 如何设置 HTTP Referrer？”。这导致了这个请求：

GET http://www.google.cz/search?hl=cs&source=hp&biw=1276&bih=866&q=How+does+Google+set+the+HTTP+Referrer+when+someone+clicks+on+a+search+result+link%3F&aq=f&aqi=&aql=&oq=&gs_rfai=&fp=b29a84a7dd59af16 HTTP/1.1
Referer: http://www.google.cz/

从那里，我点击了第一个结果链接：当有人点击搜索结果链接时，Google 如何设置 HTTP Referrer？ 该点击被 JS 事件捕获并重新路由到此重定向器：

GET http://www.google.cz/url?sa=t&source=web&cd=1&ved=0CBoQFjAA&url=http%3A%2F%2Fstackoverflow.com%2Fquestions%2F4402502%2Fhow-does-google-set-the-http-referrer-when-someone-clicks-on-a-search-result-link&rct=j&q=How%20does%20Google%20set%20the%20HTTP%20Referrer%20when%20someone%20clicks%20on%20a%20search%20result%20link%3F&ei=WTgBTeOXLsHB8QPO44ybCA&usg=AFQjCNE22KabWH5TnkK1sRLGmqWQ4EvwxQ HTTP/1.1
Referer: http://www.google.cz/search?hl=cs&source=hp&biw=1276&bih=866&q=How+does+Google+set+the+HTTP+Referrer+when+someone+clicks+on+a+search+result+link%3F&aq=f&aqi=&aql=&oq=&gs_rfai=&fp=b29a84a7dd59af16

包含此重定向片段：

<body><a href="https://stackoverflow.com/questions/4402502/how-does-google-set-the-http-referrer-when-someone-clicks-on-a-search-result-link" id=link target=_parent></body><script>var a=parent,b=parent.google,c=location;if(a!=window&&b){if(b.r){b.r=0;document.getElementById("link").click();}}else{document.getElementById("link").click();};</script><noscript><META http-equiv="refresh" content="0;URL='https://stackoverflow.com/questions/4402502/how-does-google-set-the-http-referrer-when-someone-clicks-on-a-search-result-link'"></noscript>

最后把我送到了真实的网址：

GET https://stackoverflow.com/questions/4402502/how-does-google-set-the-http-referrer-when-someone-clicks-on-a-search-result-link HTTP/1.1
Referer: http://www.google.cz/url?sa=t&source=web&cd=1&ved=0CBoQFjAA&url=http%3A%2F%2Fstackoverflow.com%2Fquestions%2F4402502%2Fhow-does-google-set-the-http-referrer-when-someone-clicks-on-a-search-result-link&rct=j&q=How%20does%20Google%20set%20the%20HTTP%20Referrer%20when%20someone%20clicks%20on%20a%20search%20result%20link%3F&ei=WTgBTeOXLsHB8QPO44ybCA&usg=AFQjCNE22KabWH5TnkK1sRLGmqWQ4EvwxQ

所以，你是对的——这里的大部分繁重工作都是通过 JavaScript 完成的，尽管也涉及到一些服务器端代码。

于 2010-12-09T20:01:09.663 回答