#20264: URLValidator should allow underscores in local hostname
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Reporter: arthurdebert | Owner: nobody
Type: Bug | Status: closed
Component: Core (Other) | Version: master
Severity: Normal | Resolution: invalid
Keywords: | Triage Stage: Unreviewed
Has patch: 1 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 1 | UI/UX: 0
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Changes (by apollo13):
* status: new => closed
* resolution: => invalid
Comment:
An underscore is not valid as per RFC-952 (we are talking '''hostname'''
in URLs and not '''DNS records''', I am aware that DNS records like srv
require/allow underscores). RFC-1123 section 2.1 later on relaxed that but
still didn't allow an underscore. RFC-2821 increased the length, but
again, no adding of underscore.
To answer:
> I've ran into this from such URLs we are seening in the wild. A great
number of tools ( popular browsers, curl, wget , BIND) will allow for such
addresses (underscore in the local part).
Browsers do whatever they think is best, from their point of view it
obviously makes no sense to disallow underscores. BIND obviously has no
reason to disallow it either since it's valid for DNS records (yes, most
likely even for A-records, which still doesn't make them valid with regard
to the HTTP rfc + related ones)
--
Ticket URL: <https://code.djangoproject.com/ticket/20264#comment:5>
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