Use `Response.challenges()` to get the schemes and realms of any authentication challenges. When fulfilling a `Basic` challenge, use `Credentials.basic(username, password)` to encode the request header.

=== ":material-language-kotlin: Kotlin"
    ```kotlin

	public final fun body ()Lokhttp3/ResponseBody;
	public final fun cacheControl ()Lokhttp3/CacheControl;
	public final fun cacheResponse ()Lokhttp3/Response;
	public final fun challenges ()Ljava/util/List;
	public fun close ()V
	public final fun code ()I
	public final fun handshake ()Lokhttp3/Handshake;
	public final fun header (Ljava/lang/String;)Ljava/lang/String;

	public final fun body ()Lokhttp3/ResponseBody;
	public final fun cacheControl ()Lokhttp3/CacheControl;
	public final fun cacheResponse ()Lokhttp3/Response;
	public final fun challenges ()Ljava/util/List;
	public fun close ()V
	public final fun code ()I
	public final fun handshake ()Lokhttp3/Handshake;
	public final fun header (Ljava/lang/String;)Ljava/lang/String;

        .addHeader("Last-Modified: " + formatDate(-1, TimeUnit.HOURS))
        .addHeader("Expires: " + formatDate(1, TimeUnit.HOURS))
        .code(responseCode)
        .body("ABCDE")
        .addHeader("WWW-Authenticate: challenge")
    when (responseCode) {
      HttpURLConnection.HTTP_PROXY_AUTH -> {
        builder.addHeader("Proxy-Authenticate: Basic realm=\"protected area\"")
      }

      HttpURLConnection.HTTP_UNAUTHORIZED -> {