@Override
    public Converter<Object, RequestBody> requestBodyConverter(
            Type type,
            Annotation[] parameterAnnotations,
            Annotation[] methodAnnotations,
            Retrofit retrofit) {
        return new RequestBodyConverter<Object>();
    }
Fastjson for Retrofit Converter Json Factory.
<p>
Compatible fastjson 1.2.x

@author ligboy, wenshao
@author Victor.Zxy
@see Converter.Factory
@since 2.0.2
fastjson1-compatible/src/main/java/com/alibaba/fastjson/support/retrofit/Retrofit2ConverterFactory.java