public ManualGrpcSecurityMetadataSource setDefault(final AccessPredicate predicate) {
        this.defaultAttributes = wrap(predicate);
        return this;
    }
Sets the default that will be used if no specific configuration has been made.

@param predicate The default predicate used to check the {@link Authentication}.
@return This instance for chaining.
grpc-server-spring-boot-starter/src/main/java/net/devh/boot/grpc/server/security/check/ManualGrpcSecurityMetadataSource.java