# Functions
NewBodyWrapper creates a new BodyWrapper.
NewRespWriterWrapper creates a new RespWriterWrapper.
# Structs
BodyWrapper wraps a http.Request.Body (an io.ReadCloser) to track the number of bytes read and the last error.
RespWriterWrapper wraps a http.ResponseWriter in order to track the number of bytes written, the last error, and to catch the first written statusCode.