Add a www-authenticate header to our response (BB-1692)

Authentication failed.

• Java 1.6
• httpcore-4.1.jar
• httpclient-4.1.1.jar

Server require an authentication and return 401 status code.
But server dont tell client to which authentication scheme is needed.

Sample Code
{{{
#!java

DefaultHttpClient httpclient = new DefaultHttpClient();
try {
HttpGet httpget = new HttpGet("https://api.bitbucket.org/1.0/repositories/shuji.w6e/receipt-box/issues/");
httpclient.getCredentialsProvider().setCredentials(new AuthScope("api.bitbucket.org", 443),
new UsernamePasswordCredentials("shuji.w6e", "********"));
HttpResponse response = httpclient.execute(httpget);
HttpEntity entity = response.getEntity();
System.out.println(response.getStatusLine());
if (entity != null) {
System.out.println("Response content length: " + entity.getContentLength());
}
EntityUtils.consume(entity);
} finally {
httpclient.getConnectionManager().shutdown();
}
}}}
Server response is not contains "WWW-Authenticate" header.
Please append a header suche as "WWW-Authenticate: Basic realm="Authentication required".