how to use setMaxConnPerRoute and setMaxConnTotal with httpclient5?

Question

setMaxConnPerRoute() and setMaxConnTotal() are not available with HttpClientBuilder for httpclient5 migrating httpclient 4.5 to 5.2 for spring boot 3 compatibility. Below is the reference code:

BasicHttpClientConnectionManager cm = new BasicHttpClientConnectionManager();
cm.setConnectionConfig(connConfig);

CloseableHttpClient client = HttpClientBuilder.create()
    .disableAutomaticRetries()
    .setDefaultRequestConfig(RequestConfig.custom()
        .setConnectionRequestTimeout(Timeout.ofMilliseconds(30000))
        .build())
    .setConnectionManager(cm)
    .setMaxConnPerRoute(50)
    .setMaxConnTotal(200)
    .build();

Answer 1

As said in the comments, use the PoolingHttpClientConnectionManagerBuilder:

 var connectionManager = PoolingHttpClientConnectionManagerBuilder.create()
     .setMaxConnPerRoute(50)
     .setMaxConnTotal(200)
     .setConnectionConfig(/* add connectionConfig */)
     .build();

 var client = HttpClients.custom()
     .disableAutomaticRetries()
     .setDefaultRequestConfig(/* add requestConfig */)
     .setConnectionManager(connectionManager)
     .build();