How to Authenticate Remote URL Access in Java?

Requesting Authentication for Remote URL Access in Java

Connecting to a remote URL that requires authentication can be challenging. A common issue arises when attempting to connect to a URL using code like the given example:

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

Without proper authentication, this code may encounter a 401 error. To address this situation, we can modify the code to provide a username and password програмmatically:

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();

In this modified version:

• The URLConnection object is initialized and used to retrieve input stream.
• userpass is a concatenation of username and password.
• basicAuth generates a Basic authentication header encoded in Base64.
• The "Authorization" request property is set with the basic authentication header, allowing the connection to authenticate successfully.

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