Android Question [SOLVED] Redpin ? Rest API ?

I would like to add more information about my previous post : I know what a Rest request is. And I was able to check if the server is receiving the information.

But what I can't get is this :
- if I do a GET request for example sending {"action":"getMapList"} to http://server : port / {"action":"getMapList"} the server gets the request but returns nothing
- so my question about any information is to check if I do it correctly

Just guessing from a similar case using SOAP, depending on the message structure and server implementarion, there's sometimes in the header a "ReplyTo" and/or "From" field. So, the answer doesn't go to the packet's sender but to the address pointed by this field.

Thanks a lot Jordi, you were right. Many thanks for your help