While the server side added support for MediaType and parameter https://github.com/spring-projects/spring-framework/blob/09917fad7bca9b3997522f0a75d6319203f2127f/spring-webmvc/src/main/java/org/springframework/web/servlet/config/annotation/ApiVersionConfigurer.java#L98 the client side ApiVersionInserter did not, https://github.com/spring-projects/spring-framework/blob/main/spring-web/src/main/java/org/springframework/web/client/ApiVersionInserter.java#L32