code: public final void setDefaultContentType(@NotNull final SerializedDataType type,
              final EnhancedMimeType contentType) {
  
          Contract.requireArgNotNull("type", type);
          Contract.requireArgNotNull("contentType", contentType);
  
          contentTypes.put(type, contentType);
  
      }
docs: Sets the default content type to use if no content type is given.
  
  @param type
  Type of the data.
  @param contentType
  Content type like "application/xml" or "application/json" (without parameters - Only base
  type).