public static void set(RequestContext ctx, CoroutineContext coroutineContext) {
        requireNonNull(ctx, "ctx");
        requireNonNull(coroutineContext, "coroutineContext");
        ctx.setAttr(COROUTINE_CONTEXT_KEY, coroutineContext);
    }
Associates the given coroutine context with {@code COROUTINE_CONTEXT_KEY} attribute in the context.
kotlin/src/main/java/com/linecorp/armeria/common/kotlin/CoroutineContexts.java