final HttpServletRequest servletRequest = webRequest.getNativeRequest(HttpServletRequest.class);
HttpInputMessage inputMessage = new ServletServerHttpRequest(servletRequest);
RequestBody annot = methodParam.getParameterAnnotation(RequestBody.class);
if (!annot.required()) {
InputStream inputStream = inputMessage.getBody();
if (inputStream == null) {
return null;
}
else if (inputStream.markSupported()) {