Springs RestTemplate default connection pool

Question

Just wondering if RestTemplate out of the box uses connection pooling or does it simply establish a new connection each time ?

Answer 1

I believe RestTemplate doesn’t use a connection pool to send requests, it uses a SimpleClientHttpRequestFactory that wraps a standard JDK’s HttpURLConnection opening and closing the connection.

Indeed you can configure RestTemplate to use a pooled implementation such as HttpComponentsClientHttpRequestFactory but most-likely you might also need to configure some settings to prevent requests from timing out.

I have blogged about this issue at Troubleshooting Spring's RestTemplate Requests Timeout