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https://issues.apache.org/jira/browse/HTTPCLIENT-1966?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16752236#comment-16752236
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Oleg Kalnichevski commented on HTTPCLIENT-1966:
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[~mikolajb] HttpClient does not use {{SocksSocketImpl}} directly. It uses
{{java}}.net.Socket.
Oleg
> System Proxy - HTTP and SOCKS
> -----------------------------
>
> Key: HTTPCLIENT-1966
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1966
> Project: HttpComponents HttpClient
> Issue Type: Bug
> Components: HttpClient (Windows)
> Affects Versions: 4.5.5, 4.5.6
> Reporter: Mikolaj Broniszewski
> Priority: Major
>
> Hello,
> I have created a proxy server basing on squid solution. And I have hidden the
> server (Apache Tomcat 8) which I would like to access behind this proxy (it's
> not available from my local machine directly). Then, I have created an
> example project which only connects to this hidden server basing on Apache
> HttpClient libraries:
> * org.apache.httpcomponents:httpcore:4.4.11
> * org.apache.httpcomponents:httpclient:4.5.6
> The code looks like:
> {code:java}
> public static void main(String ...args) throws Exception {
> System.setProperty("https.proxyHost", "<proxy_url>");
> System.setProperty("https.proxyPort", "<proxy_port>");
> System.setProperty("socksProxyHost", "<proxy_url>");
> System.setProperty("socksProxyPort", "<proxy_port>");
> URI uri = new URI("https://<hidden_server_url>");
> try (CloseableHttpClient build = HttpClientBuilder.create()
> .useSystemProperties()
> .build()) {
> final HttpUriRequest uriRequest = RequestBuilder.get()
> .setUri(uri)
> .build();
> try (CloseableHttpResponse response =
> build.execute(uriRequest)) {
> final StatusLine statusLine = response.getStatusLine();
> System.out.println(statusLine.toString());
> }
> }
> }
> {code}
> Unfortunately, as squid does not support SOCKS protocol, opening socket and
> waiting for response hangs the program. I was thinking that maybe I'm basing
> on invalid server configuration however when using below code everything
> works fine for same system properties:
> {code:java}
> public static void main(String ...args) throws Exception {
> System.setProperty("https.proxyHost", "<proxy_url>");
> System.setProperty("https.proxyPort", "<proxy_port>");
> System.setProperty("socksProxyHost", "<proxy_url>");
> System.setProperty("socksProxyPort", "<proxy_port>");
> URI uri = new URI("https://<hidden_server_url>");
> try (InputStream stream = uri.toURL().openStream()){
> String s = IOUtils.toString(stream, "UTF-8");
> System.out.println(s != null);
> } catch (IOException e) {
> e.printStackTrace();
> }
> }
> {code}
> So java itself handles it correctly. What is more if I simply remove the
> socksProxyHost and socksProxyPort settings, then Apache HttpClient connects
> correctly to the hidden server. I don't think that having both HTTPS proxy
> configuration and SOCKS is incorrect as according to Oracle documentation:
> [https://docs.oracle.com/javase/8/docs/technotes/guides/net/proxies.html]
> {code:java}
> "Now, what happens when both a SOCKS proxy and a HTTP proxy are defined? Well
> the rule is that settings for higher level protocols, like HTTP or FTP, take
> precedence over SOCKS settings. So, in that particular case, when
> establishing a HTTP connection, the SOCKS proxy settings will be ignored and
> the HTTP proxy will be contacted. Let's look at an example:"
> {code}
> As in Apache HttpClient I'm using system properties (useSystemProperties) I
> would expect that it is handled the same as Oracle does (the SOCK proxy
> should be ignored). I also checked it for simple HTTP proxy (http.proxyHost,
> http.proxyPort) and it acts the same (fails).
> Could you please help me with this issue?
> Best regards,
> Mikolaj Broniszewski
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