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POTwitter oauth Request Token Response code 401
 

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  1. POTwitter oauth Request Token Response code 401
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    <p>I am working on a twitter oauth login. However, when I do the <code>request_token</code>, the very first step, the response code always return <code>401 Unauthorized</code>. </p> <p>I have searched a lot for a week, but I cannot find the solution, please help.</p> <p>Here is my connection:</p> <pre><code>URL url = new URL("https://api.twitter.com/oauth/request_token"); HttpURLConnection conn = (HttpURLConnection)url.openConnection(); conn.setRequestProperty("Host","api.twitter.com"); conn.setRequestProperty("Authorization", data); conn.setRequestMethod("POST"); conn.connect(); </code></pre> <p>For my data:</p> <pre><code>String data = "OAuth oauth_nonce=\"" + oauth_nonce + "\", oauth_callback=\"" + oauth_callback + "\", oauth_signature_method=\"" + oauth_signature_method + "\", oauth_timestamp=\"" + oauth_timestamp + "\", oauth_consumer_key=\"" + oauth_consumer_key + "\", oauth_signature=\"" + oauth_signature + "\", oauth_version=\"" + oauth_version + "\""; </code></pre> <p>Also, I am sure that my signature is right, because I used the parameter of twitter example, I can calculate the same result as its example, so I think my method is right.</p> <p>Here is my calculation:</p> <pre><code>String oauth_para = "oauth_callback=" + oauth_callback + "&amp;oauth_consumer_key=" + oauth_consumer_key + "&amp;oauth_nonce=" + oauth_nonce + "&amp;oauth_signature_method=" + oauth_signature_method + "&amp;oauth_timestamp=" + oauth_timestamp + "&amp;oauth_version=" + oauth_version; String signingRequests = "POST&amp;" + requestToken + "&amp;" + URLEncoder.encode(oauth_para, "UTF-8"); String key = oauth_consumer_secret + "&amp;"; SecretKeySpec signingKey = new SecretKeySpec(key.getBytes(), "HmacSHA1"); Mac mac = null; try { mac = Mac.getInstance("HmacSHA1"); mac.init(signingKey); } catch(Exception e) { System.err.println("Error: " + e); } byte[] rawHmac = mac.doFinal(signingRequests.getBytes()); String oauth_signature = Base64.encodeBytes(rawHmac); oauth_signature = URLEncoder.encode(oauth_signature); </code></pre> <p>I understand that the nonce and timestamp should be random and unique. So, my method is like that:</p> <pre><code>StringBuffer buffer = new StringBuffer("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"); StringBuffer sb = new StringBuffer(); Random r = new Random(); int range = buffer.length(); for (int i = 0; i &lt; 43;i ++) { sb.append(buffer.charAt(r.nextInt(range))); } long epoch = System.currentTimeMillis() / 1000; String oauth_nonce = sb.toString(); </code></pre> <p>Can somebody help me? </p> <p>P.S: I have also removed my apps, and then create a new one. The result also is the same. Also, the apps is write and read already.</p>
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    1. COMake sure that your servers time is synced to within five minutes of Twitter's servers.
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    2. COWhen you're building your signing requests string what is the value of requestToken? It should be empty as this is the first step of the OAuth process.
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    3. CODid you ever get this working, Ian? I'm having the same problems (401).
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