I am hosting several webpages on one server.
For Routing, I am using haproxy.
Now, one funny user wants an umlaut-domain "supportbär.de".
#haproxy.cfg
frontend http-in
..
acl is_supportbaer hdr_dom(host) -i supportbär
use_backend supportbaer_wp if is_supportbaer
Usually, this works. But in this case, backend "supportbaer_wp" is not used.
Can haproy handle umlaut-domains? How?
Nothing can handle umlaut domains - as domains can not have an umlaut.
The browser has to translate them to another form because the URL can not be transmitted in umlauts.
http://en.wikipedia.org/wiki/Internationalized_domain_name
has the algorithms.
This was done for compatibility.
So, HaProxy will not see the ae - it will see the coding according to IDN. Use that and it should work.
Example of IDNA encoding[edit] IDNA encoding may be illustrated using the example domain Bücher.ch. “Bücher” is German for “books”, and .ch is the ccTLD of Switzerland. This domain name has two labels, Bücher and ch. The second label is pure ASCII, and is left unchanged. The first label is processed by Nameprep to give bücher, and then converted to Punycode to result in bcher-kva. It is then prefixed with xn-- to produce xn--bcher-kva. The resulting label suitable for use in the DNS is therefore xn--bcher-kva.ch.
For conversions you can use an online IDN service, such as http://mct.verisign-grs.com/
