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Just wondering if RestTemplate out of the box uses connection pooling or does it simply establish a new connection each time ?
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Yes, Spring RestTemplateBuilder uses Apache HttpClient for pooling (usage).
Spring Boot uses HikariCP as the default connection pool, due to its remarkable performance and enterprise-ready features.
When you set up connection pooling, instead of closing the client HTTP connection after use, CICS keeps the connection open and stores it in a pool in a dormant state. The dormant connection can be reused by the same application or by another application that connects to the same host and port.
RestTemplate delegates to a ClientHttpRequestFactory, and one of the implementations of this interface uses Apache's HttpClient.
Yes, Spring RestTemplateBuilder uses Apache HttpClient for pooling (usage). RestTemplateBuilder creates HttpComponentsClientHttpRequestFactory and uses HttpClientBuilder.
HttpClientBuilder, by default, sets pool size per route (host) to 5 and total pool size to 10 (source):
s = System.getProperty("http.maxConnections", "5"); int max = Integer.parseInt(s); poolingmgr.setDefaultMaxPerRoute(max); poolingmgr.setMaxTotal(2 * max); To check connection pool logging set logging level as follows:
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