Re: Boost.URL -- some notes

From: Дмитрий Архипов (grisumbras_at_[hidden])
Date: 2022-06-08 20:40:14

ср, 8 июн. 2022 г., 03:07 Gavin Lambert via Boost <boost_at_[hidden]>:

> The parsing-level distinction between the two is generically obvious and
> does not require recognition of the specific scheme; if the scheme colon
> is immediately followed by one or more slashes then it's an URL,
> otherwise it is not.  But this is off-topic.

This is wrong, there's absolutely no syntactic distinction between URIs and
URLs. The distinction is in their purpose. Consult this section:

https://datatracker.ietf.org/doc/html/rfc3986#section-1.1.3

The two slashes mean that URI contains the authority part. One slash means
it doesn't. What it means for the URI is essentially decided by the scheme
or the application authors.

> 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.
>
> They're still URLs, regardless of whether they resolve to a valid web
> resource or not.  (They're also URIs, of course.)

How could they be URLs, when they aren't supposed to be used to Locate
anything, and the defining characteristic of being a URL is that it
describes how to get the thing?

>