code: @Deprecated
      public byte[] getPostBody() throws AuthFailureError {
          // Note: For compatibility with legacy clients of volley, this implementation must remain
          // here instead of simply calling the getBody() function because this function must
          // call getPostParams() and getPostParamsEncoding() since legacy clients would have
          // overridden these two member functions for POST requests.
          Map<String, String> postParams = getPostParams();
          if (postParams != null && postParams.size() > 0) {
              return encodeParameters(postParams, getPostParamsEncoding());
          }
          return null;
      }
docs: Returns the raw POST body to be sent.
  
  @throws AuthFailureError In the event of auth failure
  
  @deprecated Use {@link #getBody()} instead.