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
26550	Underscore (_) is not allowed in domain names	Fedor Tyurin	nobody	"I'm using domain name like xxx_yyy.abc.com and I get ""Bad Request (400)"" when DEBUG = False.

I happened to be so that split_domain_port(host) from django/http/request.py returns a pair of empty strings as host_validation_re doesn't allow underscore.

I agree that according to RFC it's not possible to have underscore in a hostname, but here we are dealing with domain names and it's totally fine to have underscore in a domain name."	Uncategorized	closed	HTTP handling	1.8	Normal	duplicate			Unreviewed	0	0	0	0	0	0