How to Configure HttpURLConnection to Use a Proxy?

How to Configure HttpURLConnection to Use a Proxy

When attempting to establish an HTTP connection without explicitly setting a proxy, it may not respect the system proxy settings. To resolve this, there are methods to configure HttpURLConnection explicitly to use a proxy.

In Java 1.5 and later, an HttpURLConnection can be configured to use a proxy by passing in a java.net.Proxy instance to the openConnection(proxy) method. For example:

// Proxy instance with IP address 10.0.0.1 and port 8080
Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("10.0.0.1", 8080));
HttpURLConnection conn = (HttpURLConnection) new URL(urlString).openConnection(proxy);

If the proxy requires authentication, it will respond with an HTTP 407 error. To handle this, an Authenticator can be used:

Authenticator authenticator = new Authenticator() {
    @Override
    public PasswordAuthentication getPasswordAuthentication() {
        return new PasswordAuthentication("user", "password".toCharArray());
    }
};
Authenticator.setDefault(authenticator);

Setting the default Authenticator will provide the credentials necessary for the proxy authentication. By utilizing these methods, the HttpURLConnection will effectively use the provided proxy settings.

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