I couldnt modify http request from flex, instead I can add custom headers to the mx.messaging.messages.IMessage that RemoteObject sends to the server and there, extending flex.messaging.services.remoting.adapters.JavaAdapter (used for accessing Spring beans), it's posible to read the header parameters and put them into the HTTPRequest.
In the flex part, I had to extend mx.rpc.AsyncRequest:
declares a new property "header" and overwrites invoke method that checks if there is a not null value for set the msg.headers.
and mx.rpc.remoting.mxml.RemoteObject:
the constructor creates a new instance of our custom AsyncRequest and overwrite old AsyncRequest and it defines a setHeaders method that set the argument to the custom AsyncRequest.
com.asfusion.mate.actions.builders.RemoteObjectInvoker (extra :P):
this one reads the param declared in the Mate's map RemoteObjectInvoker and puts in the RemoteObject header.
I hope it will be understandable (with my apache english xDDD)
Best Answer
All IO in Flex is asynchronous. The typical pattern to deal with this is to use an
AsyncResponder. For instance: