Redirect 浏览器如何处理@&引用；在url域中？

如果您访问此url

https://stackoverflow.com@duckduckgo.com/

它带你去duckduckgo。如果您尝试

curl

，它仍然会返回duckduckgo html

---

对于这种行为，我找不到任何解释或RFC。幕后发生了什么？为什么

stackoverflow.com

部分被完全忽略？

在URL解析中

@

通常用于界定用户和主机信息

我认为直到

@

所有内容都被解析为

用户信息

，然后用于定义

主机

见：

此外，还包含以下关于保留字符的信息：

   Many URL schemes reserve certain characters for a special meaning:
   their appearance in the scheme-specific part of the URL has a
   designated semantics. If the character corresponding to an octet is
   reserved in a scheme, the octet must be encoded.  The characters ";",
   "/", "?", ":", "@", "=" and "&" are the characters which may be
   reserved for special meaning within a scheme. No other characters may
   be reserved within a scheme.

最后从

确保阅读

3.2。权限部分

和

3.2.1。用户信息

零件

authority   = [ userinfo "@" ] host [ ":" port ]