Proxy Authentication with JDK 11 HttpClient

Question

I'm trying to use JDK 11 HttpClient to make requests through a corporate proxy which requires authentication by login and password. According to JDK's intro, I'm building an instance of client by means of:

HttpClient httpClient = HttpClient.newBuilder()
        .version(HTTP_1_1)
        .proxy(ProxySelector.of(new InetSocketAddress("proxy.mycompany.com", 3128)))
        .authenticator(authenticator)
        .build();

, where authenticator is:

Authenticator authenticator = new Authenticator() {
  @Override
  protected PasswordAuthentication getPasswordAuthentication() {
    return new PasswordAuthentication("login", "password".toCharArray());
  }
};

And then I execute the request itself:

HttpRequest outRequest = HttpRequest.newBuilder()
        .version(HTTP_1_1)
        .GET()
        .uri(URI.create("https://httpwg.org/asset/http.svg")) // no matter which URI to request
        .build();
HttpResponse<String> inResponse = httpClient.send(outRequest, BodyHandlers.ofString());

But instead of valid response from the target server (https://httpwg.org) I receive HTTP 407 (Proxy Authentication Required), i.e. HttpClient does not use the provided authenticator.

I've tried various solutions mentioned here and here but none of them helped.

What is the correct way to make it work?

Answer 1

You have to set the "Proxy-Authorization" header on the request.

HttpClient httpClient = HttpClient.newBuilder()
        .version(HTTP_1_1)
        .proxy(ProxySelector.of(new InetSocketAddress("proxy.mycompany.com", 3128)))
        .build();

String encoded = new String(Base64.getEncoder().encode("login:password".getBytes()));

HttpRequest outRequest = HttpRequest.newBuilder()
                                    .version(HTTP_1_1)
                                    .GET()
                                    .uri(URI.create("https://httpwg.org/asset/http.svg")) // no matter which URI to request
                                    .setHeader("Proxy-Authorization", "Basic " + encoded)
                                    .build();

Answer 2

By default, basic authentication with the proxy is disabled when tunneling through an authenticating proxy since java 8u111.

You can re-enable it by specifying -Djdk.http.auth.tunneling.disabledSchemes="" on the java command line.

See the jdk 8u111 release notes