How to handle HTTP authentication using HttpURLConnection?

Question

I\'m writing a Java client that POSTs to a HTTP server that requires authentication.
I have to support at least the following three authentication metho

Answer 1

Related to @Mat's comment :

Here is an example used by my team and I :

import org.apache.commons.codec.binary.Base64;

HttpGet getRequest = new HttpGet(endpoint);
getRequest.addHeader("Authorization", "Basic " + getBasicAuthenticationEncoding());

private String getBasicAuthenticationEncoding() {

        String userPassword = username + ":" + password;
        return new String(Base64.encodeBase64(userPassword.getBytes()));
    }

Hope it helps!