Major Description
Upon Scott Banachowski's request, this is to add HTTP transport support for the rpc usage of avro C++ version. The current implementation uses HTTP POST to send over a request body (of any content) and the server side responds with a standard HTTP response body (of any content).
Current status: it only requires a user to provide a streambuf input and define a function that contains the business logic to generate the serialized content into a response streambuf. testhttpserver would be a good example there.