http - 路径部分中带有//的 URL 是否有效？

Question

我有一个关于 URL 的问题:

我读过 RFC 3986并且仍然对一个 URL 有疑问:

If a URI contains an authority component, then the path component
must either be empty or begin with a slash ("/") character. If a URI does not contain an authority component, then the path cannot begin
with two slash characters ("//"). In addition, a URI reference
(Section 4.1) may be a relative-path reference, in which case the
first path segment cannot contain a colon (":") character. The ABNF
requires five separate rules to disambiguate these cases, only one of which will match the path substring within a given URI reference. We use the generic term "path component" to describe the URI substring
matched by the parser to one of these rules.

我知道，//server.com:80/path/info 是有效的(它是模式相对 URL)

我也知道 http://server.com:80/path//info 是有效的。

但我不确定下面的是否有效:

http://server.com:80//path/info

我的问题背后的问题是，当由 URI http:/创建时，cookie 不会发送到 http://server.com:80//path/info/server.com:80/path/info 限制为 /path

Answer 1

参见 url with multiple forward slashes, does it break anything? , Are there any downsides to using double-slashes in URLs? , What does the double slash mean in URLs?和 RFC 3986 - Uniform Resource Identifier (URI): Generic Syntax .

共识:浏览器将按原样处理请求，不会更改请求。 / 字符是路径分隔符，但作为路径段定义为:

path-abempty  = *( "/" segment )
segment       = *pchar

表示 http://example.com/ 之后的斜杠可以直接跟另一个斜杠，无限次。服务器可能会忽略它，但浏览器不会，如您所知。

短语:

If a URI does not contain an authority component, then the path cannot beginwith two slash characters ("//").

允许protocol-relative URLs ，但在这种情况下明确说明可能不存在权限(server.com:80 在您的示例中)。

所以:是的，它是有效的，不，不要使用它。