@Bean
    @ConditionalOnMissingBean(AuthenticatingServerInterceptor.class)
    public DefaultAuthenticatingServerInterceptor authenticatingServerInterceptor(
            final AuthenticationManager authenticationManager,
            final GrpcAuthenticationReader authenticationReader) {
        return new DefaultAuthenticatingServerInterceptor(authenticationManager, authenticationReader);
    }
The security interceptor that handles the authentication of requests.

@param authenticationManager The authentication manager used to verify the credentials.
@param authenticationReader The authentication reader used to extract the credentials from the call.
@return The authenticatingServerInterceptor bean.
grpc-server-spring-boot-starter/src/main/java/net/devh/boot/grpc/server/autoconfigure/GrpcServerSecurityAutoConfiguration.java