@Override
    protected void applyHeaders() {
        // Copy the HTTP headers which were specified by a user to the Armeria request.
        getHeaders().forEach((name, values) -> headers.set(HttpHeaderNames.of(name), values));
        setDefaultRequestHeaders(headers);
    }
A {@link ClientHttpRequest} implementation for the Armeria HTTP client.
spring/spring6/src/main/java/com/linecorp/armeria/spring/internal/client/ArmeriaClientHttpRequest.java