Pooling RestTemplante setReadTimeout

Question

I need to create a pool of connectors using apache.httpcomponents.client5:httpclient5:5.2.1* and SpringBoot(ver 3.1.5) RestTemplate.

This code works correctly:

private static RestTemplate pooledRestTemplate() {
 PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager();
 connectionManager.setMaxTotal(2000);
 connectionManager.setDefaultMaxPerRoute(2000);
 
 HttpClient httpClient =
 HttpClientBuilder.create().setConnectionManager(connectionManager).build();
 
 return new RestTemplateBuilder()
 .requestFactory(() -> new HttpComponentsClientHttpRequestFactory(httpClient))
 .setConnectTimeout(Duration.ofMinutes(5))
 .build();
 }

But if I add .setReadTimeout() to the builder:

 return new RestTemplateBuilder()
 .requestFactory(() -> new HttpComponentsClientHttpRequestFactory(httpClient))
 .setConnectTimeout(Duration.ofMinutes(5))
 .setReadTimeout(Duration.ofMinutes(5))
 .build();

When the application starts, an error message appears:

java.lang.IllegalStateException: Request factory org.springframework.http.client.HttpComponentsClientHttpRequestFactory has the setReadTimeout method marked as deprecated

I read about this moment when updating the version https://github.com/spring-projects/spring-boot/issues/35658. But I didn't understand how to combine the pool of connectors and RestTemplateBuilder.

Answer 1

A solution came up in https://github.com/spring-projects/spring-framework/issues/32121 HttpComponentsClientHttpRequestFactory no longer supports the setReadTimeout method.

You must configure the HttpClient completely and pass it to the build of RestTemplat. And use setConnectionRequestTimeout along with setReadTimeout:

PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager();
 connectionManager.setMaxTotal(2000);
 connectionManager.setDefaultMaxPerRoute(2000);
 
 RequestConfig config =
 RequestConfig.custom()
 .setResponseTimeout(Timeout.ofMinutes(1))
 .setConnectionRequestTimeout(Timeout.ofMinutes(1))
 .build();
 
 HttpClient httpClient =
 HttpClientBuilder.create()
 .setConnectionManager(connectionManager)
 .setDefaultRequestConfig(config)
 .build();
 
 return new RestTemplateBuilder()
 .requestFactory(() -> new HttpComponentsClientHttpRequestFactory(httpClient))
 .basicAuthentication(
 SecurityUtils.getUsername(credential), SecurityUtils.getPassword(credential))
 .build();