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    <p>Apache HTTP Client 3.1 will not natively honor HTTP Proxies returned from the default ProxySelector or user implementations.</p> <h2>Quick Summary of ProxySelector</h2> <p>ProxySelector is a service class which selects and returns a suitable Proxy for a given URL based on its scheme. For example, a request for <code>http://somehost</code> will try to provide an HTTP proxy if one is defined. The default ProxySelector can be configured at runtime using System Properties, such as <code>http.proxyHost</code> and <code>http.proxyPort</code>. </p> <h2>HTTPUrlConnection</h2> <p>An instance of HTTPUrlConnection will check against the default ProxySelector multiple times: 1st to select for <code>http</code> or <code>https</code>, then later when it builds the raw tcp socket, using the <code>socket</code> scheme. A SOCKS proxy could be used to proxy a raw tcp socket but are not often found in corporate environments, so a raw tcp socket will usually receive no proxy.</p> <h2>HTTP Client 3.1</h2> <p>HC 3.1, on the other hand, will <strong>never check the default ProxySelector for the <code>http</code>/<code>https</code> schemes</strong>. It will check, however, at a later points for the <code>socket</code> scheme when it eventually builds the raw socket - This is the request you are seeing. This means the System Properties <code>http.proxyHost</code> and <code>http.proxyPort</code> are ineffective. This is obviously not ideal for most people who only have an HTTP/HTTPS proxy.</p> <p>To work around this, you have two options: define a proxy on each HC 3.1 connection or implement your own HC 3.1 HTTPConnectionManager.</p> <h3>HTTPConnectionManager</h3> <p>The HTTPConnectionManager is responsible for building connections for the HC 3.1 client.</p> <p>The default HC 3.1 HTTPConnectionManager can be extended so that it looks for a suitable proxy from a ProxySelector (default or custom) when building the request in the same way HTTPUrlConnection does:</p> <pre><code>public class MyHTTPConnectionManager extends SimpleHttpConnectionManager { @Override public HttpConnection getConnectionWithTimeout( HostConfiguration hostConfiguration, long timeout) { HttpConnection hc = super.getConnectionWithTimeout(hostConfiguration, timeout); try { URI uri = new URI( hostConfiguration.getHostURL()); List&lt;Proxy&gt; hostProxies = ProxySelector.getDefault().select(uri); Proxy Proxy = hostProxies.get(0); InetSocketAddress sa = (InetSocketAddress) Proxy.address(); hc.setProxyHost(sa.getHostName()); hc.setProxyPort(sa.getPort()); } catch (URISyntaxException e) { return hc; } return hc; } } </code></pre> <p>Then, when you create an HC 3.1 client, use your new connection manager:</p> <pre><code>HttpClient client = new HttpClient(new MyHTTPConnectionManager() ); </code></pre>
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