CODEWITHSUNDEEP
subdomain
cedivad
cedivad

Reputation: 2644

Plus sign "+" on subdomains names

example: hello+all.domain.com works with chrome/firefox. it does not with ie/safari.

I suppose that there isn't a workaround for this, right? thanks

I add that using urlencode "works": an urencoded url works with both ie/safari, but does not with chrome/firefox. However can't use 2 urls for the same staff.

Upvotes: 7

Views: 4633

Answers (2)

Thomas Weller
Thomas Weller

Reputation: 59575

The definition for host names can be found in RFC 952 and was updated by RFC 1152 to allow longer host names (24 -> 63).

Even with IDN (Wikipedia), the basic limitations regarding the valid characters of RFC 952 still exist, as there are (correction mine):

  1. A "name" (Net, Host, Gateway, or Domain name) is a text string up to 24 63 characters drawn from the alphabet (A-Z), digits (0-9), minus sign (-), and period (.).

In IDN, Unicode characters are converted to the allowed set of characters with Punycode, RFC 3492. However, ASCII characters (0 to 127 decimal) are not punified, so the + character (43 decimal) will remain as is and thus be invalid.

Upvotes: 5

pimlottc
pimlottc

Reputation: 3146

The "plus sign" character is not permitted in a valid domain name. From RFC952:

A "name" (Net, Host, Gateway, or Domain name) is a text string up to 24 characters drawn from the alphabet (A-Z), digits (0-9), minus sign (-), and period (.). Note that periods are only allowed when they serve to delimit components of "domain style names".

Upvotes: 7

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