在什么情况下，HTTP_REFERER为空 [英] In what cases will HTTP_REFERER be empty

问题描述

我知道可以得到一个空的HTTP_REFERER。在什么情况下会发生这种情况？如果我得到一个空的，它总是意味着用户改变了吗？得到一个空的和一个空的一样吗？

I know it's possible to get an empty HTTP_REFERER. Under what circumstances does this happen? If I get an empty one, does it always mean that the user changed it? Is getting an empty one the same as getting a null one? and under what circumstances do I get that too?

推荐答案

当最终用户

• 在浏览器地址栏中输入了网站网址。


• 通过浏览器维护的书签访问了该网站。 >
  
• 已将网站作为第一页在窗口/标签中访问。


• 从https网址切换到http网址。


• 从https网址切换到其他https网址。


• 安装了安全软件（防病毒/防火墙等），可从所有请求中剥离引荐来源网址。
$ b $

• 以编程方式访问网站（例如 curl ），而不设置引荐来源网页标头（searchbots！）。

• entered the site URL in browser address bar itself.
• visited the site by a browser-maintained bookmark.
• visited the site as first page in the window/tab.
• switched from a https URL to a http URL.
• switched from a https URL to a different https URL.
• has security software installed (antivirus/firewall/etc) which strips the referrer from all requests.
• is behind a proxy which strips the referrer from all requests.
• visited the site programmatically (like, curl) without setting the referrer header (searchbots!).

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