WebMvcConfig.java

@Configuration 
public class WebMvcConfig implements WebMvcConfigurer   {
 
    @Bean
    public ConfigurableServletWebServerFactory webServerFactory() {
        
        TomcatServletWebServerFactory tomcat = new TomcatServletWebServerFactory();
        tomcat.addConnectorCustomizers((TomcatConnectorCustomizer) connector -> {
 
            // configure maxSwallowSize
            if ((connector.getProtocolHandler() instanceof AbstractHttp11Protocol<?>)) {
                // -1 means unlimited, accept bytes
                ((AbstractHttp11Protocol<?>) connector.getProtocolHandler()).setMaxSwallowSize(-1);
            }
            
        });
        tomcat.setPort(8089);
        
        return tomcat;
    }
}