code: @javax.annotation.Nonnull
      public java.util.Optional<String> optionalMediaType() {
          return java.util.Optional.ofNullable(mMediaType);
      }
docs: The media type used for encoding. There will need to exist a serializer
  registered for this. If the media type is not set, it is assumed to be
  &#39;application/vnd.apache.thrift.binary&#39;, the default thrift serialization.
  
  @return Optional of the <code>media_type</code> field value.