ServletPathExtensionContentNegotiationStrategy(context: ServletContext)
Create an instance without any mappings to start with. Mappings may be added later when extensions are resolved through ServletContext#getMimeType(String) or via org.springframework.http.MediaTypeFactory.
ServletPathExtensionContentNegotiationStrategy(servletContext: ServletContext, @Nullable mediaTypes: MutableMap<String, MediaType>)
Create an instance with the given extension-to-MediaType lookup.