protected final void close(Throwable exception, boolean cancelled) {
        final StatusAndMetadata statusAndMetadata = exceptionHandler.handle(ctx, exception);
        close(new ServerStatusAndMetadata(statusAndMetadata.status(), statusAndMetadata.metadata(),
                                          cancelled), exception);
    }
Cancels a call when the call was closed by a client, not by server.
grpc/src/main/java/com/linecorp/armeria/internal/server/grpc/AbstractServerCall.java