public static void set(RequestContext ctx, HttpHeaders trailers) {
        requireNonNull(ctx, "ctx");
        requireNonNull(trailers, "trailers");
        ctx.setAttr(GRPC_WEB_TRAILERS, trailers);
    }
Sets the specified gRPC-Web trailers to the {@link RequestContext}.
core/src/main/java/com/linecorp/armeria/internal/common/InternalGrpcWebTrailers.java