为什么 http://在浏览器导航栏中包含两个斜杠和 file:///三个? [英] Why does http:// contain two slashes and file:/// three in a browser navigation bar?

问题描述

为什么 http:// 包含两个斜杠——这只是一个 URL 的标准，还是有任何逻辑意义?为什么 file:/// 包含三个斜杠，如 file:///C:/a.html ?

Why does http:// contain two slashes—is that just a standard for a URL, or does it have any logical meaning? And why does file:/// contain three slashes, as in file:///C:/a.html?

推荐答案

权威组件 必须以 // 开头:

权限组件前面有一个双斜线(//")[…]

The authority component is preceded by a double slash ("//") […]

这也是为什么并非所有 URI 都包含双斜杠:因为并非所有 URI 都具有权限组件(例如，使用 mailto 方案、xmpp 方案等的 URI).

This is also why not all URIs contain the double slash: because not all URIs have an authority component (e.g., URIs using the mailto scheme, the xmpp scheme, etc.).

如果您想知道为什么为 (HTTP) URI 选择双斜杠而不是其他东西(或什么都不做)，请参阅 Tim Berners-Lee 的常见问题解答 为什么是//、# 等? → //的历史是什么?

If you wonder why the double slash instead of something else (or nothing) was chosen for (HTTP) URIs, see Tim Berners-Lee’s FAQ Why the //, #, etc? → What is the history of the //?

tl;dr:他复制了 Apollo 使用的文件名语法.

tl;dr: He copied the filename syntax which Apollo used.

顺便说一句，他后悔那个选择:

By the way, he regrets that choice:

我不得不说，现在我很遗憾语法如此笨拙.我希望 http://www.example.com/foo/bar/baz 被写成 http:com/example/foo/bar/baz 在客户端会发现 www.example.com 存在并且是要联系的服务器.但现在已经晚了.

I have to say that now I regret that the syntax is so clumsy. I would like http://www.example.com/foo/bar/baz to be just written http:com/example/foo/bar/baz where the client would figure out that www.example.com existed and was the server to contact. But it is too late now.

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