Our partner dotSource has a problem with the content delivery endpoint. They have a multi-language site with 7 different languages. One of them is Taiwan (zh_CN). According to our documentation the configuration should look like this:

 
So the node name is “zh_CN”. But when i do it like this and do some test request “localhost:8080/.rest/delivery/tours/v1?lang=zh_CN” i get the following error message:
{
"error":

}
 
After some debugging i found out that the class “I18nContainerRequestFilter” checks if the languageTag is valid “isValidLanguageTag”. But the right language Tag seems to be “zh-CN”.

 
Everything works fine if i do the request like this: “localhost:8080/.rest/delivery/tours/v1?lang=zh-CN”
 
dotSource tested with magnolia-rest-content-delivery-2.1.4
I tested with magnolia-rest-content-delivery-2.2 with the standard Travel Demo
 
The expectation from dotSource is that the API takes the same language tag wich our templating function is providing. -> https://documentation.magnolia-cms.com/display/DOCS62/cmsfn#cmsfn-Getlocalizedlinks