How to Authenticate Remote URL Connections in Java and Handle 401 Errors?

Authenticating Remote URL Connections in Java

When connecting to remote URLs protected by authentication, you may encounter a 401 error. Here's how you can handle authentication programatically using Java.

Original Code:

URL url = new URL(String.format("http://%s/manager/list", _host + ":8080"));
HttpURLConnection connection = (HttpURLConnection)url.openConnection();

Solution:

Instead of the provided code, you can use the following approach:

URL url = new URL("location address");
URLConnection uc = url.openConnection();
String userpass = username + ":" + password;
String basicAuth = "Basic " + new String(Base64.getEncoder().encode(userpass.getBytes()));
uc.setRequestProperty ("Authorization", basicAuth);
InputStream in = uc.getInputStream();

This native alternative allows you to specify the username and password directly through the setRequestProperty method. The Authorization header is set using a Basic authentication scheme, and the user credentials are encoded using Base64.

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