3.WebSocket URIs
This specification defines two URI schemes, using the ABNF syntax
defined in RFC 5234 [RFC5234], and terminology and ABNF productions
defined by the URI specification RFC 3986 [RFC3986].
本说明书定义了两种格式的URI，一种是[RFC5234]定义的ABNF ，一种是 [RFC3986]中定义的术语和ABNF。
ws-URI = "ws:" "//" host [ ":" port ] path [ "?" query ]
wss-URI = "wss:" "//" host [ ":" port ] path [ "?" query ]
// 对上面格式的说明
host = <host, defined in [RFC3986], Section 3.2.2>
port = <port, defined in [RFC3986], Section 3.2.3>
path = <path-abempty, defined in [RFC3986], Section 3.3>
query = <query, defined in [RFC3986], Section 3.4>
The port component is OPTIONAL; the default for "ws" is port 80,
while the default for "wss" is port 443.
端口选项是可选的；“ws”的默认端口是80，“wss”的默认端口是443.
The URI is called "secure" (and it is said that "the secure flag is
set") if the scheme component matches "wss" case-insensitively.
假如URI与“wss”匹配（不区分大小写），该URI就被称之为“安全的”（并且被称之为“安全标记已经设置”）。
The "resource-name" (also known as /resource name/ in Section 4.1)
can be constructed by concatenating the following:
o "/" if the path component is empty
o the path component
o "?" if the query component is non-empty
o the query component
“资源名”（同4.1节中的/资源名/）由以下部分组成：
- "/" 当路径为空的情况使用。
- 路径。
- "?" 当查询参数不为空使用。
- 查询参数。
Fragment identifiers are meaningless in the context of WebSocket URIs
and MUST NOT be used on these URIs. As with any URI scheme, the
character "#", when not indicating the start of a fragment, MUST be
escaped as %23.
在websocket的URI中，片段标识符是没有含义的而且不应该被使用。就像其它URI一样，当“#”不代表片段的开始时，必须转换成“%23”。