[twitter-dev] oauth request token failing

[Berto]

Hey guys,

I'm writing a client in java and trying to use oauth to get an access
token.  However, I keep getting an IOException which essentially means
I'm getting an HTTP 401 error back (unauthorized).  I've verified that
my signature algorithm is correct by using some provided examples over
at oauth.net, but nothing seems to be working for me.  Does the
consumer key need an & after it?  I'm using the exact values provided
via the register oauth client page.  Here's a snippet of the code:

HttpURLConnection connection = null;
            BufferedReader reader = null;
            StringBuilder responseBuilder;
            Date date = new Date();
            long time = date.getTime();
            long timestamp = time / 1000;
            Random tmp = new Random();

            try {
                StringBuilder stuff = new StringBuilder();
                stuff.append(encode("oauth_consumer_key"));
                stuff.append("=");
                stuff.append(encode(CONSUMER_KEY));
                stuff.append("&");
                stuff.append(encode("oauth_nonce"));
                stuff.append("=");
                stuff.append(encode(Long.toString(timestamp +
tmp.nextInt(1000))));
                stuff.append("&");
                stuff.append(encode("oauth_signature_method"));
                stuff.append("=");
                stuff.append(encode("HMAC-SHA1"));
                stuff.append("&");
                stuff.append(encode("oauth_timestamp"));
                stuff.append("=");
                stuff.append(encode(Long.toString(timestamp)));
                stuff.append("&");
                stuff.append(encode("oauth_version"));
                stuff.append("=");
                stuff.append(encode("1.0"));

                StringBuffer base = new
StringBuffer("GET").append("&")
                .append(encode("http://twitter.com/oauth/
request_token")).append("&");
                base.append(encode(stuff.toString()));
                String oauthBaseString = base.toString();

                String sig = signature(oauthBaseString,
CONSUMER_SECRET);

                StringBuilder params = new StringBuilder();
                params.append(encode("oauth_consumer_key"));
                params.append("=\"");
                params.append(encode(CONSUMER_KEY));
                params.append("\", ");
                params.append(encode("oauth_signature_method"));
                params.append("=\"");
                params.append(encode("HMAC-SHA1"));
                params.append("\", ");
                params.append(encode("oauth_signature"));
                params.append("=\"");
                params.append(encode(sig));
                params.append("\", ");
                params.append(encode("oauth_timestamp"));
                params.append("=\"");
                params.append(encode(Long.toString(timestamp)));
                params.append("\", ");
                params.append(encode("oauth_nonce"));
                params.append("=\"");
                params.append(encode(Long.toString(timestamp +
tmp.nextInt(1000))));
                params.append("\", ");
                params.append(encode("oauth_version"));
                params.append("=\"");
                params.append(encode("1.0"));
                params.append("\"");

                // Prepare the connection
                URL url = new URL("http://twitter.com/oauth/
request_token");
                connection = (HttpURLConnection) url.openConnection();
                connection.setRequestMethod("GET");

                connection.setRequestProperty("WWW-Authenticate",
"OAuth " + params.toString());

                connection.setConnectTimeout(30000);
                connection.setReadTimeout(30000);

                // Read the response
               int code = -1;
                try {
                code = connection.getResponseCode();
                } catch (IOException e) {
                   e.printStackTrace();
                }
                reader = new BufferedReader(new
InputStreamReader(connection.getInputStream()));
                responseBuilder = new StringBuilder();

                String line = null;
                while ((line = reader.readLine()) != null) {
                    responseBuilder.append(line);
                }