Unicode domain support in browsers
Date: 10 May 2015Author: Erik Dubbelboer
According to RFC 3492 Unicode domains are encoded using Punycode. So http://日本語.jp is actually http://xn–wgv71a119e.jp
I was interested in when browsers would use Unicode and when they would use Punycode. Here are the results of my tests:
| browser | location bar | location.href | dom referrer | http referrer |
|---|---|---|---|---|
| firefox 36 | Unicode | Unicode | ASCII | ASCII |
| safari 8.0.3 | Unicode | ASCII | ASCII | ASCII |
| chrome 41 | ASCII | ASCII | ASCII | ASCII |
| IE 9 | Unicode | Unicode | Unicode | ASCII |
| IE 11 | Unicode | Unicode | Unicode | ASCII |
| opera 12 | Unicode | Unicode | Unicode | ASCII |
| opera 28 | ASCII | ASCII | ASCII | ASCII |