Add body to a OK message from the server

[PaulaMerino]

Hi, I am new in metasploit and I've been traing to change the size of the pakeage send by the server when the client send a request to ask for any order to execute (reverse shell http). I tried to change it in lib/rex/proto/http/response.rb and set the body in the initialize method with "self.body =

Hello!

", but it doesnt work and I dont really understand why, because when I change for exaple the message or the code, it works. Any idea about how con I do it?