No encontré nada ya hecho para tener una anotación para agregar un encabezado con un valor, así que hice el mío. Aquí está el código, es muy simple, lo hice usando Spring AOP

1. Creé las clases de anotación.

    import java.lang.annotation.ElementType; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target; @Retention(RetentionPolicy.RUNTIME) @Target(ElementType.METHOD) public @interface ResponseHeader { public String key() default ""; public String value() default ""; }

   y el que contiene una matriz de anotaciones de encabezados

    import java.lang.annotation.ElementType; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target; @Retention(RetentionPolicy.RUNTIME) @Target(ElementType.METHOD) public @interface ResponseHeaders { public ResponseHeader[] headers(); }

2. La clase AOP para capturar los restControllers (puede personalizar el AOP para configurar su propio punto de corte como desee:

    import YOUR_PACKAGE_ANNOTATION.ResponseHeaders; import org.aspectj.lang.annotation.After; import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.Pointcut; import org.springframework.stereotype.Component; import org.springframework.web.context.request.RequestContextHolder; import org.springframework.web.context.request.ServletRequestAttributes; import javax.servlet.http.HttpServletResponse; import java.util.List; /** * Aspect for inserting headers on the methods of the @RestController annotated classes */ @Aspect @Component public class ResponseHeadersAnnotation { /** * Pointcut for filtering just classes with @RestController annotation */ @Pointcut("@within(org.springframework.web.bind.annotation.RestController)") public void restControllerClass() { } /** * It adds the headers to the response of the method of the controller * * @param responseHeaders */ @After("restControllerClass() && @annotation(responseHeaders)") public void addHeaders(final ResponseHeaders responseHeaders) { final HttpServletResponse response = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getResponse(); List.of(responseHeaders.headers()).forEach(responseHeader -> response.setHeader(responseHeader.key(), responseHeader.value())); } }

3. Aquí hay un ejemplo de cómo usarlo en un controlador:

    @GetMapping(value = {"/ServiceTicketCollection", "/ServiceRequestCollection"}) @ResponseHeaders(headers = { @ResponseHeader(key = "cookie1", value = "value1"), @ResponseHeader(key = "cookie2, value = "value2") }) public Object restControllerMethod() { ... }

Este es un ejemplo de cómo proporcionar un valor predeterminado para un encabezado usando Spring WebFlux

 @Component public class CorrelationIdFilter implements WebFilter { @Override public Mono<Void> filter(ServerWebExchange exchange, WebFilterChain chain) { var correlationId = exchange.getRequest().getHeaders().getFirst(CORRELATION_ID_HEADER); if (correlationId == null || correlationId.isEmpty()) { correlationId = UUID.randomUUID().toString(); ServerHttpRequest mutatedRequest = exchange.getRequest() .mutate() .header(CORRELATION_ID_HEADER, correlationId) .build(); exchange = exchange .mutate() .request(mutatedRequest) .build(); } exchange.getResponse().getHeaders().add(CORRELATION_ID_HEADER, correlationId); return chain.filter(exchange); } }

Y esto es para Spring web

 @Component public class CorrelationIdFilter implements Filter { static final String CORRELATION_ID_HEADER = "X-Correlation-ID"; @Override public void init(FilterConfig filterConfig) { // empty } @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { HttpServletRequest httpRequest = (HttpServletRequest) request; String correlationId = httpRequest.getHeader(CORRELATION_ID_HEADER); if (correlationId == null) { correlationId = XidFactory.nextXid(); ((HttpServletResponse) response).addHeader(CORRELATION_ID_HEADER, correlationId); } chain.doFilter(request, response); } @Override public void destroy() { // empty } }