Request/Response Body Buffer Handling

[atn1990]

I have a question about how the buffers for body processing in either request or response phases work. How many copies are made internally/externally when calling get_rqst_body_str_cb or get_resp_body_str_cb? We currently make a few copies of all the data before calling process or process_response and want to understand how to make the whole thing as efficient as possible.