OPERATING SYSTEM
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All

JAVA VERSION
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All 5.0, 6 and Java 7 SDKs.

DESCRIPTION
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If we attempt to connect to a URL with no trailing slash (e.g. "http://www.ibm.com") through a proxy which uses DIGEST authentication, the authentication, and the HTTP request, fails. If we add a trailing slash ("http://www.ibm.com/") the request succeeds.

The request succeeds with or without the trailing slash when we use proxies with other authentication methods. The problem only exists with DIGEST authentication.

REPRODUCTION INSTRUCTIONS
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1. Set up a HTTP proxy that uses DIGEST authentication.
2. Edit the testcase provided below, adding the relevant details
   (proxy URL and username/password).
3. Execute the following Java commands:
      javac Main.java
      javac MyAuthenticator.java
      java Main

Expected Result:
The web page should be displayed

Actual Result:
returning PasswordAuthentication: java.net.PasswordAuthentication@563b563b
returning PasswordAuthentication: java.net.PasswordAuthentication@5b6a5b6a
returning PasswordAuthentication: java.net.PasswordAuthentication@5bb05bb
returning PasswordAuthentication: java.net.PasswordAuthentication@320f320f
returning PasswordAuthentication: java.net.PasswordAuthentication@56ff56ff
returning PasswordAuthentication: java.net.PasswordAuthentication@7bd97bd9
returning PasswordAuthentication: java.net.PasswordAuthentication@23172317
returning PasswordAuthentication: java.net.PasswordAuthentication@47f347f3
returning PasswordAuthentication: java.net.PasswordAuthentication@71227122
returning PasswordAuthentication: java.net.PasswordAuthentication@1acf1acf
returning PasswordAuthentication: java.net.PasswordAuthentication@41534153
returning PasswordAuthentication: java.net.PasswordAuthentication@662d662d
returning PasswordAuthentication: java.net.PasswordAuthentication@4b1a4b1a
returning PasswordAuthentication: java.net.PasswordAuthentication@229b229b
returning PasswordAuthentication: java.net.PasswordAuthentication@480b480b
returning PasswordAuthentication: java.net.PasswordAuthentication@36293629
returning PasswordAuthentication: java.net.PasswordAuthentication@56915691
returning PasswordAuthentication: java.net.PasswordAuthentication@b800b80
returning PasswordAuthentication: java.net.PasswordAuthentication@38d538d5
returning PasswordAuthentication: java.net.PasswordAuthentication@5daf5daf
java.net.ProtocolException: Server redirected too many times (20)
        at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1246)
        at Main.main(Main.java:32)

TESTCASE SOURCE
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Main.java
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import java.io.IOException;
import java.io.InputStream;
import java.net.Authenticator;
import java.net.HttpURLConnection;
import java.net.InetSocketAddress;
import java.net.MalformedURLException;
import java.net.Proxy;
import java.net.SocketAddress;
import java.net.URL;

public class Main {
    public static void main(String[] args) {
        System.setProperty("http.auth.digest.validateServer", "true");
        System.setProperty("http.auth.digest.validateProxy", "true");

        Authenticator.setDefault(new MyAuthenticator());

        try {
            SocketAddress addr = new InetSocketAddress("[INSERT PROXY URL HERE]", [INSERT PROXY PORT HERE]);
            Proxy proxy = new Proxy(Proxy.Type.HTTP, addr);
            HttpURLConnection urlConnection = (HttpURLConnection) new
                                              URL("http://www.ibm.com").openConnection(proxy);
            InputStream in = urlConnection.getInputStream();
            int c;
            while ((c = in.read()) != -1) {
                System.out.write(c);
            }
            in.close();
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
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MyAuthenticator.java
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import java.net.Authenticator;
import java.net.PasswordAuthentication;

public class MyAuthenticator extends Authenticator {
    String username = "[INSERT USERNAME HERE]";
    String pwd = "[INSERT PASSWORD HERE]";

    protected PasswordAuthentication getPasswordAuthentication() {
        PasswordAuthentication pwdAuth = new PasswordAuthentication(username,
                                                                    pwd.toCharArray());
        System.out.println("returning PasswordAuthentication: "+pwdAuth);
        return pwdAuth;
    }
}
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