private static HttpHeaders springHeaders(RequestHeaders headers) {
        final HttpHeaders springHeaders = new HttpHeaders();
        toHttp1Headers(headers, springHeaders, (output, key, value) -> output.add(key.toString(), value));
        return springHeaders;
    }
A {@link ServerHttpRequest} implementation for the Armeria HTTP server.
spring/boot3-webflux-autoconfigure/src/main/java/com/linecorp/armeria/spring/web/reactive/ArmeriaServerHttpRequest.java