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

问题描述

我知道有可能得到一个空的 HTTP_REFERER.在什么情况下会发生这种情况?如果我得到一个空的，是否总是意味着用户更改了它?得到一个空的和得到一个空的一样吗?在什么情况下我也会得到它?

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

最终用户会/可能为空

• 在浏览器地址栏中输入网站 URL.
• 通过浏览器维护的书签访问了该网站.
• 在窗口/选项卡中作为第一页访问了该网站.
• 点击了外部应用程序中的链接.
• 从 https 网址切换到 http 网址.
• 从 https 网址切换到不同的 https 网址.
• 已安装安全软件(防病毒/防火墙/等)，可从所有请求中去除引荐来源网址.
• 位于一个代理后面，该代理从所有请求中去除引荐来源网址.
• 以编程方式访问网站(例如，curl)而不设置引荐来源标头(搜索机器人！).

• 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.
• clicked a link in an external application.
• 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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