@ 在没有编码的 url 中的用途
purpose of @ in urls without encoding
据我所知
following symbols are reserved and can't be used without encoding in url.
* ' ( ) ; : @ & = + $ , / ? % # [ ]
在 url 中 @without 编码的真正目的是什么？
如何使用？
根据RFC2396，这是一个“保留字符”：
[ ... ] their usage within the URI component is limited to their reserved
purpose. If the data for a URI component would conflict with the
reserved purpose, then the conflicting data must be escaped before
forming the URI.
虽然没有什么阻止它被使用，只要它的使用不与预期目的冲突：
The "reserved" syntax class above refers to those characters that are
allowed within a URI, but which may not be allowed within a
particular component of the generic URI syntax; they are used as
delimiters of the components described in Section 3.
第 3 节指出：
The authority component is preceded by a double slash "//" and is
terminated by the next slash "/", question-mark "?", or by the end of
the URI. Within the authority component, the characters ";", ":",
"@", "?", and "/" are reserved.
所以 @ 符号是有效的，只要没有查询字符串。
@ 也适用于 mailto 协议，并通过基于 IP 的协议 (<userinfo>@<host>:<port>) 直接连接到指定的服务器，但如果不是，则可以省略使用用户信息：
The parts "@" and ":" may be omitted.
server = [ [ userinfo "@" ] hostport ]
据我所知
following symbols are reserved and can't be used without encoding in url.
* ' ( ) ; : @ & = + $ , / ? % # [ ]
在 url 中 @without 编码的真正目的是什么？ 如何使用？
根据RFC2396，这是一个“保留字符”：
[ ... ] their usage within the URI component is limited to their reserved purpose. If the data for a URI component would conflict with the reserved purpose, then the conflicting data must be escaped before forming the URI.
虽然没有什么阻止它被使用，只要它的使用不与预期目的冲突：
The "reserved" syntax class above refers to those characters that are allowed within a URI, but which may not be allowed within a particular component of the generic URI syntax; they are used as delimiters of the components described in Section 3.
第 3 节指出：
The authority component is preceded by a double slash "//" and is terminated by the next slash "/", question-mark "?", or by the end of the URI. Within the authority component, the characters ";", ":", "@", "?", and "/" are reserved.
所以 @ 符号是有效的，只要没有查询字符串。
@ 也适用于 mailto 协议，并通过基于 IP 的协议 (<userinfo>@<host>:<port>) 直接连接到指定的服务器，但如果不是，则可以省略使用用户信息：
The parts "@" and ":" may be omitted.
server = [ [ userinfo "@" ] hostport ]