code: func (req *Request) CopyTo(dst *Request) {
  	req.copyToSkipBody(dst)
  	if req.body != nil {
  		dst.bodyBuffer().Set(req.body.B)
  	} else if dst.body != nil {
  		dst.body.Reset()
  	}
  }
docs: // CopyTo copies req contents to dst except of body stream.