How RPC works on GWT?

Hi folks!
I'd like to know how RPC works, but I do not want to know about the
proxy created and that abstraction we can easily found on GWT web
page. I want to know exactly how the resquest is build. how the post
message is sent.

I was reading to source code and it seems to me that a GWT class
read it as a resource stream I saw it on RemoteServiceServlet class on
the processPost method, the first thing that this method does is to
invoke the readContent method, passing the request as parameter.

I would like to listen from you that I'm wrong and that the post
info is not read as a resource stream, but as a parameter :)

I create a Valve to tomcat and I need to get the GWT post
information before it reaches the GWT servlet. but the thing is that
if it comes as an stream I can not do that. thats bad! :(
I'm afraid that if I do that the GWT servlet won't work (I wish I were
wrong here again).

Thanks a lot folks!!!
Best Regards
JDC

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