本文主要是介绍Referer字段丢失问题，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
HTTP协议规定：
Clients SHOULD NOT include a Referer header field in a (non-secure) HTTP request if the referring page was transferred with a secure protocol.https://www.w3.org/Protocols/rfc2616/rfc2616-sec15.html#sec15.1.3
15.1.3 Encoding Sensitive Information in URI's
Because the source of a link might be private information or might reveal an otherwise private information source, it is strongly recommended that the user be able to select whether or not the Referer field is sent. For example, a browser client could have a toggle switch for browsing openly/anonymously, which would respectively enable/disable the sending of Referer and From information.
Clients SHOULD NOT include a Referer header field in a (non-secure) HTTP request if the referring page was transferred with a secure protocol.
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