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I want to create a user on Google Duo through Java Rest api. Followed documentation but getting error

I am creating a Java Rest api to create users on Google Duo admin. I am following the documentation https://duo.com/docs/adminapi and I have added auth and date/time header but still I am getting unauthorised error 401. Can anyone guide me what am I doing wrong I have read the doc and added all the mandatory headers.
public static void POSTRequest() throws IOException {
String userCredentials = "Username:Password";
String basicAuth = "Basic " + new String(Base64.getEncoder().encode(userCredentials.getBytes()));
String dateTime = OffsetDateTime.now().format(DateTimeFormatter.RFC_1123_DATE_TIME);
String POST_PARAMS = "{\n" + "\"userId\": 101,\r\n" +
" \"id\": 101,\r\n" +
" \"title\": \"Test Title\",\r\n" +
" \"body\": \"Test Body\"" + "\n}";
URL obj = new URL("https://api-e9770554.duosecurity.com");
HttpURLConnection postConnection = (HttpURLConnection) obj.openConnection();
postConnection.setRequestMethod("POST");
postConnection.setRequestProperty("Content-Type", "application/json");
postConnection.setRequestProperty("Authorization", basicAuth);
postConnection.setRequestProperty("Date", dateTime);
postConnection.setDoOutput(true);
OutputStream os = postConnection.getOutputStream();
os.write(POST_PARAMS.getBytes());
os.flush();
os.close();
int responseCode = postConnection.getResponseCode();
System.out.println("POST Response Code : " + responseCode);
System.out.println("POST Response Message : " + postConnection.getResponseMessage());
if (responseCode == HttpURLConnection.HTTP_CREATED) { //success
BufferedReader in = new BufferedReader(new InputStreamReader(
postConnection.getInputStream()));
String inputLine;
StringBuffer response = new StringBuffer();
while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
in.close();
// print result
System.out.println(response.toString());
} else {
System.out.println("POST NOT WORKED");
}
}
Error:
{
"code": 40101,
"message": "Missing request credentials",
"stat": "FAIL"
}
Response code: 401 (Unauthorized); Time: 2022ms; Content length: 73 bytes

How to run a curl command with -u parameter and json data in Java?

I want to send this request through my java code:
curl -u "user:key" -X PUT -H "Content-Type: application/json" -d "{"status":"test", "reason":"test"}" https://test.com/test/id.json
I've tried using Runtime:
String command =
"curl -u \"" + user + ":" + key + "\" -X PUT -H \"Content-Type: application/json\" -d \""
+ "{\\\"status\\\":\\\"test\\\","
+ "\\\"reason\\\":\\\"test\\\"}\" "
+ urlString + jsonID + ".json";
Runtime.getRuntime().exec(command);
I've also tried ProcessBuilder:
String[] command2 = {"curl", "-u", "\"" + user + ":" + key + "\"", "-X", "PUT", "-H", "\"Content-Type: application/json\"", "-d",
"\"{\\\"status\\\":\\\"test\\\",\\\"reason\\\":\\\"test\\\"}\"",
urlString + jsonID + ".json"};
Process proc = new ProcessBuilder(command2).start();
And finally with Apache HttpClient
credsProvider.setCredentials(new AuthScope("test.com", 80), new UsernamePasswordCredentials(user, key));
HttpClientBuilder clientbuilder = HttpClients.custom();
clientbuilder = clientbuilder.setDefaultCredentialsProvider(credsProvider);
CloseableHttpClient httpClient = clientbuilder.build();
HttpPut put = new HttpPut(urlString + jsonID + ".json");
put.setHeader("Content-type", "application/json");
String inputJson = "{\n" +
" \"status\": \"test\",\n" +
" \"reason\": \"test\"\n" +
"}";
try {
StringEntity stringEntity = new StringEntity(inputJson);
put.setEntity(stringEntity);
System.out.println("Executing request " + put.getRequestLine());
HttpResponse response = null;
response = httpClient.execute(put);
BufferedReader br = new BufferedReader(
new InputStreamReader((response.getEntity().getContent())));
if (response.getStatusLine().getStatusCode() != 200) {
throw new RuntimeException("Failed : HTTP error code : "
+ response.getStatusLine().getStatusCode());
}
StringBuffer result = new StringBuffer();
String line = "";
while ((line = br.readLine()) != null) {
System.out.println("Response : \n"+result.append(line));
}
} catch (UnsupportedEncodingException e1) {
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
The Runtime and ProcessBuilders didn't return any results, but Apache HttpClient returned an Error 401 even though my credentials are correct. If I were to copy the command string and enter it into terminal, it would give a valid response.
Any help please? I've been on this for hours :(

Finally got it working
String host = //use your same url but replace the https:// with www
String uriString = String.format("https://%s:%s#%s%s.json", user, key, host, jsonID);
Log.debug("Sending PUT request to URI: {}\n\n", uriString);
try {
URI uri = new URI(uriString);
HttpPut putRequest = new HttpPut(uri);
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add((new BasicNameValuePair("status", status)));
nameValuePairs.add((new BasicNameValuePair("reason", "TEST " + status.toUpperCase())));
putRequest.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = HttpClientBuilder.create().build().execute(putRequest);
System.out.println("\n");
Log.debug("Retrieving API response");
BufferedReader br = new BufferedReader(
new InputStreamReader((response.getEntity().getContent())));
if (response.getStatusLine().getStatusCode() != 200) {
throw new RuntimeException("Failed : HTTP error code : "
+ response.getStatusLine().getStatusCode());
}
StringBuffer result = new StringBuffer();
String line = "";
while ((line = br.readLine()) != null) {
Log.debug("Response : \n{}", result.append(line));
}
}
Hope this helps anyone looking for a similar solution in the future. Again this is for a curl request that looks like this:
curl -u "user:key" -X PUT -H "Content-Type: application/json" -d "{"key":"value", "key2":"value2"}" https://test.com/test/id.json

get MailChimp response with Java

I want to use the MailChimp api to add a subscriber. As a start, want to read from one of the REST I'm trying to get a response back from the MailChimp api.
I seem to be doing the authorization correctly as I'm getting status 200, but for some reason, I am not getting the response.
Here is the code so far:
public void doPostAction() throws IOException{
// BASIC Authentication
String name = "user";
String password = apikey;
String authString = name + ":" + password;
byte[] authEncBytes = Base64.encodeBase64(authString.getBytes());
String authStringEnc = new String(authEncBytes);
URL urlConnector = new URL(url);
HttpURLConnection httpConnection = (HttpURLConnection) urlConnector.openConnection();
httpConnection.setRequestMethod("GET");
httpConnection.setDoOutput(true);
httpConnection.setDoInput(true);
httpConnection.setRequestProperty("Content-Type", "application/json; charset=UTF-8");
httpConnection.setRequestProperty("Accept", "application/json");
httpConnection.setRequestProperty("Authorization", "Basic " + authStringEnc);
InputStream is = httpConnection.getInputStream();
// check status
System.out.println("DoPost: status: " + httpConnection.getResponseCode());
StringBuilder sb = new StringBuilder();
BufferedReader br = new BufferedReader(new InputStreamReader(is, "utf-8"));
String line = null;
while ((line = br.readLine()) != null) {
sb.append(line + "\n");
}
System.out.println("DoPost response: \n" + line);
br.close();
}
Looking at the MailChimp playground, it seems like I'm missing out on a lot...
How do I get the response?
****/ EDIT /****
If anyone's looking at the above code, the output should be:
System.out.println("DoPost response: \n" + sb); // not line

OK, the above code works. Basic error.
I was examining the line variable when it was null, not the response...
When I change to:
System.out.println("DoPost response: \n" + line); // not line
System.out.println("DoPost response: \n" + sb); // but sb StringBuilder
...it works.

Unable to set Authorization header of HttpsURLConnection

I'm trying to set the OAuth Authorization header of a HttpsURLConnection object and below is the java code for that
String url1 = "/data/ServiceAccount?schema=1.0&form=json&byBillingAccountId={EQUALS,xyz#pqr.edu}";
String url = "https://secure.api.abc.net/data/ServiceAccount?schema=1.0&byBillingAccountId={EQUALS,xyz#pqr.edu}";
String header = OAuthClient.prepareURLWithOAuthSignature(url1);
HttpsURLConnection con = null;
try {
URL obj = new URL(url);
con = (HttpsURLConnection) obj.openConnection();
con.setRequestMethod("GET");
con.setRequestProperty("Authorization", "OAuth " + header);
System.out.println("Request properties = " + con.getRequestProperty("Authorization"));
int responseCode = con.getResponseCode();
System.out.println("Response Code = " + responseCode);
BufferedReader in = new BufferedReader(
new InputStreamReader(con.getInputStream()));
String inputLine;
StringBuffer response = new StringBuffer();
while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
in.close();
con.disconnect();
//print result
System.out.println("Response = " + response.toString());
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if(con!=null) con.disconnect();
}
And below is the code for prepareURLWithOAuthSignature
public String prepareURLWithOAuthSignature(String url)
{
String signature = null;
setOAuthParameters();
setOAuthQParams();
try
{
httpURL = URLEncoder.encode(baseURL+url, "UTF-8");
signature = OAuthSignatureService.getSignature(httpURL, URLEncoder.encode(URLEncodedUtils.format(qparams, "UTF-8"), "UTF-8"), consumer_secret);
OAuthParameters.put("oauth_signature", signature);
} catch (Exception e) {
e.printStackTrace();
}
return getOAuthAuthorizationHeader();
}
public String getOAuthAuthorizationHeader()
{
String OAuthHeader = "oauth_consumer_key=\"" + OAuthParameters.get("oauth_consumer_key") + "\"" +
",oauth_signature_method=\"" + OAuthParameters.get("oauth_signature_method") + "\"" +
",oauth_timestamp=\"" + OAuthParameters.get("oauth_timestamp") + "\"" +
",oauth_nonce=\"" + OAuthParameters.get("oauth_nonce") + "\"" +
",oauth_version=\"" + OAuthParameters.get("oauth_version") + "\"" +
",oauth_signature=\"" + OAuthParameters.get("oauth_signature") + "\"";
byte[] authEncBytes = Base64.encodeBase64(OAuthHeader.getBytes());
String authStringEnc = new String(authEncBytes);
return authStringEnc;
}
The problem is that
1) while I'm printing the con.getRequestProperty("Authorization") I'm getting a null value which means the Authorization header is not set
2) The final response I'm getting from the server is 403
Any idea what's going wrong here?

I know this might not be an answer but looks like this issue was submitted as a bug to sun and here is the relevant part of the reply.
This behavior is intentional in order to prevent a security hole that
getRequestProperty() opened. setRequestProperty("Authorization")
should still work, you just won't be able to proof the results via
getRequestProperty().
For the original forum post, please see: http://www.coderanch.com/t/205485/sockets/java/setRequestProperty-authorization-JDK
I would not be able to advice why you're getting a 403 but try adding the "Content-Type" request header to your connection and see if it makes any difference. Until I added that header in my code, I was getting a 404 back from the Spring Security module.

Java - HttpURLConnection - How to insert user data into Header Response

I have a java servlet class that is performing a GET to a specific URL. I am also passing data as part of the GET.
What I need, is in my HTTP Server code that recieves this data, how do I insert user based response data into the Header back so my calling Java servlet class can read it.
I can read standard response things like .getResponseCode() etc, but I need to insert my own response into the header some how. How can this be done? and how can I read it?
This is my java servlet send class:
public void sendRequest(String data, String sendUrl) throws Throwable{
String messageEncoded = URLEncoder.encode(data, "UTF-8");
String message = URLDecoder.decode(messageEncoded);
System.out.println("messageEncoded : " + messageEncoded);
System.out.println("messageDecoded : " + message);
try {
URL url = new URL(sendUrl);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoOutput(true);
connection.setRequestMethod("GET");
OutputStreamWriter writer = new OutputStreamWriter(connection.getOutputStream());
writer.write(message);
writer.close();
BufferedReader rd = null;
StringBuilder sb = null;
String line = null;
System.out.println(" *** headers ***");
for (Entry<String, List<String>> headernew : connection.getHeaderFields().entrySet()) {
System.out.println(headernew.getKey() + "=" + headernew.getValue());
}
System.out.println(" \n\n*** Body ***");
rd = new BufferedReader(new InputStreamReader(connection.getInputStream()));
sb = new StringBuilder();
while ((line = rd.readLine()) != null) {
sb.append(line + '\n');
}
System.out.println("body=" + sb.toString());
System.out.println("connection.getResponseCode() : " + connection.getResponseCode());
System.out.println("connection.getResponseMessage()" + connection.getResponseMessage());
if (connection.getResponseCode() == HttpURLConnection.HTTP_OK) {
// Ok
} else {
// Server returned HTTP error code.
}
} catch (MalformedURLException e) {
// ...
System.out.println(this.getClass() + " : MalformedURLException Error occured due to: " + e);
} catch (IOException e) {
System.out.println(this.getClass() + " : IOException Error occured due to: " + e);
}
}