id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
25593	Remove scheme validation from URLValidator or provide all IANA acceptable schemes as defaults	Marcin Nowak	nobody	"== The problem ==

There are defined only four schemes as default:  http,https,ftp,ftps.
But URL can have many many more valid schemes. 
HTTP and FTP as good defaults are invalid - they are too limited.

There is no simple way to extend these schemes nor disable scheme validation.
We must extend URLField and redeclare `default_validators` class property, which is too complex for that simple case.
 
== Possible solutions ==

   - disable scheme validation and enable it only when user defines `allowed_schemes` directly in URLField (backward incompatible)
   - provide `allowed_schemes` as an optional argument for  URLField `init()`
   - provide all valid schemes as default set (based on https://www.iana.org/assignments/uri-schemes/uri-schemes.xhtml)

== Prefered solution ==

Provide all (IANA) valid schemes as default together with possibility to change them by URLField `init()`.
"	Uncategorized	closed	Database layer (models, ORM)	1.8	Normal	wontfix			Unreviewed	0	0	0	0	0	0