解決方案；

在啟動函式中加入

@Bean
public RestTemplate restTemplate(ClientHttpRequestFactory factory){
    return new RestTemplate(factory);
}

@Bean
public ClientHttpRequestFactory simpleClientHttpRequestFactory(){
    SimpleClientHttpRequestFactory factory = new SimpleClientHttpRequestFactory();
    factory.setReadTimeout(180000);//單位為ms
    factory.setConnectTimeout(5000);//單位為ms
    return factory;
}
 

原因待更新：