@Nullable
    public ClientRequestContext context() {
        return ctx;
    }
Returns the {@link ClientRequestContext} associated with this request.
This method returns {@code null} until the request is sent.
A non-{@code null} value is available only after {@link #future()} is complete.
spring/spring6/src/main/java/com/linecorp/armeria/spring/internal/client/ArmeriaClientHttpRequest.java