@Bean
  public Docket docket() {
    return new Docket(DocumentationType.SWAGGER_2)
        .forCodeGeneration(true)
        .globalOperationParameters(globalParameterList()) 
// ^ here we are passing the global paramters to inlcude in swagger-ui
        .select()
        .apis( RequestHandlerSelectors.withClassAnnotation(RestController.class))
        .paths(PathSelectors.any())
        .build();
  }

  private List<Parameter> globalParameterList() {

    val authTokenHeader =
        new ParameterBuilder()
            .name("AUTH-TOKEN") // name of the header
            .modelRef(new ModelRef("string")) // data-type of the header
            .required(true) // required/optional
            .parameterType("header") // for query-param, this value can be 'query'
            .description("Basic Auth Token")
            .build();

    return Collections.singletonList(authTokenHeader);
  }

@Component
@Slf4j
public class RequestFilter implements Filter {

  @Override
  public void doFilter(
      ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
      throws IOException, ServletException {
    log.info(
        "Value of AUTH-TOKEN  -> {}",
        ((HttpServletRequest) servletRequest).getHeader("AUTH-TOKEN"));
    filterChain.doFilter(servletRequest, servletResponse);
  }
}

@RestController
@RequestMapping("/hello-world")
public class HelloWorldController {

  @GetMapping
  public ResponseEntity sayHello() { // No header needed here - that got covered in docket
    return ResponseEntity.ok("Hello There!!!");
  }
}