Get operation result in json format

I’m doing a system thats get the result of the operation by http message, but I want receive in json format; how can I make in my configuration to receive the result in json format?
I’m using php to get the result by POST, the result in Json format I will get in raw format?


Does this work?


Wow I have tried this before, but I dont know why did not work before, I erase the configuration and make again and now works, very thanks Mr.