How to set encoding in Apex Listener

Question

I have a problem conversion characters when using Apex listener
The problem occurs in two different configurations:
1. APEX Listener 2.0 running on GlassFish Server Open Source Edition 4.0 Oracle Database 11g Release 11.2.0.3.0 (NLS_LANGUAGE: AMERICAN, NLS_CHARACTERSET: AL32UTF8)
2 . APEX Listener 2.0 running in standalone mode Oracle Database 10g Express Edition Release 10.2.0.1.0 (NLS_LANGUAGE: AMERICAN, NLS_CHARACTERSET: AL32UTF8)
to demonstrate the problem I created a restful service, which is in the GET method returns the result of the query :
select: p_param as "result" from dual
parameter : p_param transmitted via http header
parameter : p_param set to 'sample data дф ' , the last two characters - Cyrillic
Http Request is as follows:
GET http://xxx.xx.xxx.xxx:8080/apex/encode HTTP/1.1
Accept-Encoding: gzip, deflate
param: sample data дф
Host: xxx.xx.xxx.xxx: 8080
Connection: Keep-Alive
User-Agent: Apache-HttpClient/4.1.1 (java 1.5)
in both cases, the return value - <result> sample data 4D </ result>
I could not find documentation on how to avoid re-encoding?
regards.

Answer 1

With a WE8MSWIN1252 (or comparable charset) database, fronted by APEX listener, and the absense of NVARCHAR2 support in APEX, is there an option to build an APEX application supporting UTF-8 characters anyway, without converting the whole database to UTF-8?
As "Application Builder User’s Guide" is quite tight-lipped when it comes to UTF-8 support, can somebody recommend an APEX FAQ concerning UTF-8 support in APEX?
Thanks and regards, Tom