@GetMapping(path = "/header")
    public Mono<String> testRequestHeader(@RequestHeader("header_key1") final String headerKey1,
                                          final ServerHttpRequest serverHttpRequest) {
        LOGGER.info("header_key1:{}, receive headers: {}", headerKey1, serverHttpRequest.getHeaders());
        return successMono(serverHttpRequest.getHeaders());
    }
")
public class RequestController {

    private static final Logger LOGGER = LoggerFactory.getLogger(RequestController.class);

    /**
Test for header annotation.
@param headerKey1  one RequestHeader key
@param serverHttpRequest  request
@return response
shenyu-examples/shenyu-examples-http/src/main/java/org/apache/shenyu/examples/http/controller/RequestController.java