my android httpClient can't display arabic message

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C#

Java

Mobile

Android

server

HTTP

i built a simple http server using c# and http client using java ( android application ) to make a connection between them, the conection is work good, then my client side made a request to a server then displayed a response massage comming from my server, but when the server sent arabic response massage, my http client displays a rubbish font.
i hope to give me a suitable solution for this problem.
my regards ...