Re: Boost.URL -- some notes

From: Дмитрий Архипов (grisumbras_at_[hidden])
Date: 2022-06-07 11:21:19

вт, 7 июн. 2022 г., 03:10 Gavin Lambert via Boost <boost_at_[hidden]>:

> file is also an URL protocol, although you're correct that mailto is
> not.  I don't think anyone actually types mailto: addresses into the
> address bar on a browser, though (nor can I think of any other URIs that
> someone might manually type, except for things like about:config that
> are browser-specific).
>
There's no such thing as "URL protocol". The distinction between a URI and
a URL is purely in the way its intended to be used. Every URL is a URI,
because it Uniquely Identifies a thing. Some URIs are also URLs, because
you can Locate things with them. Any URI scheme can be used for a URL, and
I know for a fact that you can register handlers for custom URI schemes in
at least Windows, Linux, and Android. And on the other hand, http scheme is
usually associated with the idea of URL. But e.g. XML namespaces are
identified by URIs, often those are http URIs, and there's absolutely no
guarantee that the URI can be used to retrieve some document from the
Internet.

>