[ruby-core:77819] [Ruby trunk Bug#12886] URI#merge doesn't handle paths correctly

Issue #12886 has been reported by Samuel Williams.

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Bug #12886: URI#merge doesn't handle paths correctly
https://bugs.ruby-lang.org/issues/12886

* Author: Samuel Williams
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: 
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
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I feel like this should work.

~~~
> URI.parse("/base/uri") + URI.parse("relative")
URI::BadURIError: both URI are relative
~~~

The result should be URI with path = "/base/relative".

But it doesn't. It fails with an exception.

There are two ways to fix this. The first is to change the meaning of `URI#absolute?` to relate to the absoluteness of the path, not whether or not there is a scheme.

The second way to fix this is to directly work around the issue in `merge`.

In my opinion

~~~
> URI.parse("a/b") + URI.parse("c")
URI::BadURIError: both URI are relative
~~~

should also work, with a result of "a/c".

The need for the LHS of the operation to contain a scheme is not a useful requirement in practice, and in addition, I'd like to state that `URI("a/c")` is actually a valid URI. So, it's purely the `merge` function being to limited in what it will handle for no obvious reason.

Situations where this comes up: parsing a website which contains relative URLS, and you want to construct absolute URLs.



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