How do I replace Deprecated httpClient.getParams() with RequestConfig?

Question

I have inherited the code

import org.apache.http.client.HttpClient;
...
HttpClient httpclient = createHttpClientOrProxy();
...



private HttpClient createHttpClientOrProxy() {
    HttpClient httpclient = new DefaultHttpClient();

    /*
     * Set an HTTP proxy if it is specified in system properties.
     * 
     * http://docs.oracle.com/javase/6/docs/technotes/guides/net/proxies.html
     * http://hc.apache.org/httpcomponents-client-ga/httpclient/examples/org/apache/http/examples/client/ClientExecuteProxy.java
     */
    if( isSet(System.getProperty("http.proxyHost")) ) {
        int port = 80;
        if( isSet(System.getProperty("http.proxyPort")) ) {
            port = Integer.parseInt(System.getProperty("http.proxyPort"));
        }
        HttpHost proxy = new HttpHost(System.getProperty("http.proxyHost"), port, "http");
// @Deprecated methods here... getParams() and ConnRoutePNames
        httpclient.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY, proxy);
    }
    return httpclient;
}

httpClient.getParams() is @Deprecated and reads "

HttpParams  getParams()
Deprecated. 
(4.3) use RequestConfig.

There are no class docs for RequestConfig and I do not know what method should be used to replace getParams() and ConnRoutePNames.DEFAULT_PROXY.

Answer 1

This is more of a follow-up to the answer given by @Stephane Lallemagne

There is a much conciser way of making HttpClient pick up system proxy settings

CloseableHttpClient client = HttpClients.custom()
        .setRoutePlanner(
             new SystemDefaultRoutePlanner(ProxySelector.getDefault()))
        .build();

or this if you want an instance of HttpClient fully configured with system defaults

CloseableHttpClient client = HttpClients.createSystem();