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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

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.

Constant 401 error with OAuth1 (MCM API)

I've been trying to establish a connection with an API for more than a week now, to no avail. (Magic Card Market's, authentification documentation here and there). I'm supposed to receive a XML file.
I have what MCM call a "widget" access to their API, meaning that I don't have nor need a oauth_token (it's supposed to be an empty string) for the authorization header, and that I'm not supposed to receive nor use an access token/access secret.
The only things I do have are a consumer key (they call it app token sometimes) and a consumer secret.
Here is how I build my Authorization header :
private static String buildOAuthAuthorization(String method, String request)
throws UnsupportedEncodingException, NoSuchAlgorithmException, InvalidKeyException {
String mkmAppToken = APICredentials.appToken;
String mkmAppSecret = APICredentials.appSecret;
String realm = "https://www.mkmapi.eu/ws/v1.1/games";
String oauthVersion = "1.0";
String oauthConsumerKey = mkmAppToken;
String oauthToken = "";
String oauthSignatureMethod = "HMAC-SHA1";
String oauthTimestamp = Long.toString(System.currentTimeMillis() / 1000);
String oauthNonce = Long.toString(System.currentTimeMillis());
String paramString = "oauth_consumer_key=" + oauthConsumerKey
+ "oauth_nonce=" + oauthNonce
+ "oauth_signature_method=" + oauthSignatureMethod
+ "oauth_timestamp=" + oauthTimestamp
+ "oauth_token=" + oauthToken
+ "oauth_version=" + oauthVersion;
String baseString = method + "&" + rawUrlEncode(realm) + "&" + rawUrlEncode(paramString);
String signingKey = rawUrlEncode(mkmAppSecret) + "&";
Mac mac = Mac.getInstance("HMAC-SHA1");
SecretKeySpec secret = new SecretKeySpec(signingKey.getBytes(), mac.getAlgorithm());
mac.init(secret);
byte[] digest = mac.doFinal(baseString.getBytes());
byte[] oauthSignature = Base64.encode(digest, Base64.URL_SAFE);
String authorizationProperty = "OAuth "
+ "realm=\"" + realm + "\", "
+ "oauth_version=\"" + oauthVersion + "\", "
+ "oauth_timestamp=\"" + oauthTimestamp + "\", "
+ "oauth_nonce=\"" + oauthNonce + "\", "
+ "oauth_consumer_key=\"" + oauthConsumerKey + "\", "
+ "oauth_token=\""+ oauthToken + "\", "
+ "oauth_signature_method=\"" + oauthSignatureMethod + "\", "
+ "oauth_signature=\"" + oauthSignature + "\"";
System.out.println(authorizationProperty);
return authorizationProperty;
}
The actual request is in an AsyncTask :
public static class oAuthRequest extends AsyncTask<String, Integer, StringReader> {
private int lastCode;
#Override
protected StringReader doInBackground(String... requestURLs) {
String method = requestURLs[0];
String url = requestURLs[1];
StringReader result = null;
try {
String authProperty = buildOAuthAuthorization(method, url);
HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();
connection.addRequestProperty("Authorization:", authProperty);
lastCode = connection.getResponseCode();
System.out.println("RESPONSE CODE 1 " + lastCode);
// Get content
BufferedReader rd = new BufferedReader(new InputStreamReader(lastCode == 200 ? connection.getInputStream() : connection.getErrorStream()));
StringBuilder sb = new StringBuilder();
String line;
while ((line = rd.readLine()) != null) {
sb.append(line);
}
rd.close();
result = new StringReader(sb.toString());
} catch (NoSuchAlgorithmException | InvalidKeyException | IOException e) {
e.printStackTrace();
}
return result;
}
}
It seems like no matter what I change, I'm always getting a 401.
Things I've tried :
oauthSignature as a String using Base64.encodeToString()
Nonce generation using SecureRandom
With and without the empty oauthToken
Another timestamp generation method (can't remember what though)
signing key with and without app token (theorically I need only the consumer secret, but you never know)
Using HttpsURLConnection instead of HttpURLConnection (the URI start in https, so I thought, hey. But no)
At least 2-3 other different implementations (one who was basically a copy/paste of the Java example in the documentation of course -- it still kind of is one now)
(Probably a lot of things I can't even remember)
At this point I'm wondering if maybe the issue comes from my keys, as I've tried to use the Postman app to test requests with the same results.

Server returned HTTP response code: 400 for URL : HttpURLConnection Error

I am trying to replicate the following unix cURL command in java:
curl -X POST http://api.nigelsmall.com/xml-cypher -d #test/files/abba.xml
edit:
To be more specific I am trying to replicate the following cURL command in java:
curl -X POST http://api.nigelsmall.com/xml-cypher -d "<?xml version='1.0' encoding='UTF-8' ?><group><member></member></group>"
So far I have the following code:
String urlString = "http://api.nigelsmall.com/xml-cypher";
try {
URL url = new URL(urlString);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestProperty("Content-Type", "application/xml");
conn.setDoOutput(true);
conn.setRequestMethod("POST");
String data = "<?xml version='1.0' encoding='UTF-8' ?><group><member></member></group>";
OutputStreamWriter out = new OutputStreamWriter(conn.getOutputStream());
out.write(data);
out.flush();
BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String line;
while ((line = rd.readLine()) != null) {
System.out.println(line);
}
out.close();
rd.close();
}
catch (Exception e) {
System.out.println(e);
e.printStackTrace();
}
But java.io.IOException: Server returned HTTP response code: 400 for URL :http://api.nigelsmall.com/xml-cypher occurs. Can anyone find what the problem is?
The only thing I can think of is that may be I need to put my XML in a file and send it as a request. But I do not know how to do this. Could anyone help me with this? Thanks in advance.

It's not your fault. The documentation of the web-service is missing an important detail:
If posting JSON, you can do it this way. When posting XML, you have to provide the XML like if posted in an HTML form: application/x-www-form-urlencoded.
In the source code of the service you can see:
def _convert(method):
a = request.accept_mimetypes.best_match(["application/json", "text/html"])
if a == "application/json":
xml = request.get_data().decode("utf-8")
else:
xml = request.form["xml"] # <-- xml is a form field!!
# ...
I've tried it with DavidWebb which is only a tiny wrapper around HttpURLConnection and it worked:
public void testNigelsmall() throws Exception {
String payload = "<?xml version=\"1.0\" encoding=\"UTF-8\" ?>\n" +
"<group id=\"abba\">\n" +
" <member id=\"agnetha\">\n" +
" <name>Agnetha Fältskog</name>\n" +
" <birth date=\"1950-04-05\" />\n" +
" </member>\n" +
" <member id=\"frida\">\n" +
" <name>Anni-Frid Lyngstad</name>\n" +
" <birth date=\"1945-11-15\" />\n" +
" </member>\n" +
" <song id=\"waterloo\" release_date=\"1974-03-04\">\n" +
" <name>Waterloo</name>\n" +
" <length min=\"2\" sec=\"42\" />\n" +
" </song>\n" +
"</group>";
Webb webb = Webb.create();
Response<String> response = webb
.post("http://api.nigelsmall.com/xml-cypher")
.param("xml", payload)
.asString();
assertEquals(200, response.getStatusCode());
assertNotNull(response.getBody());
assertTrue(response.getBody().startsWith("CREATE"));
assertTrue(response.getBody().contains("(abba)-[:member]->(frida)"));
}
The output:
CREATE
(abba),
(agnetha {name:"Agnetha F\u00e4ltskog",`birth date`:"1950-04-05"}),
(frida {name:"Anni-Frid Lyngstad",`birth date`:"1945-11-15"}),
(waterloo {`length sec`:42,`length min`:2,name:"Waterloo"}),
(abba)-[:member]->(agnetha),
(abba)-[:member]->(frida),
(abba)-[:song {release_date:"1974-03-04"}]->(waterloo)

Java, URL output different in java output

I have a question about URI and URL
when i pass a url is work good but result is worst need help!!
as my code look like this.
import java.io.*;
import java.net.*;
import java.net.URL;
public class isms {
public static void main(String[] args) throws Exception {
try {
String user = new String ("boo");
String pass = new String ("boo");
String dstno = new String("60164038811"); //You are going compose a message to this destination number.
String msg = new String("你的哈达哈达!"); //Your message over here
int type = 2; //for unicode change to 2, normal will the 1.
String sendid = new String("isms"); //Malaysia does not support sender id yet.
// Send data
URI myUrl = new URI("http://www.isms.com.my/isms_send.php?un=" + user + "&pwd=" + pass
+ "&dstno=" + dstno + "&msg=" + msg + "&type=" + type + "&sendid=" + sendid);
URL url = new URL(myUrl.toASCIIString());
URLConnection conn = url.openConnection();
conn.setDoOutput(true);
// Get the response
BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String line;
while ((line = rd.readLine()) != null) {
// Print the response output...
System.out.println(line);
}
rd.close();
System.out.println(url);
} catch (Exception e) {
e.printStackTrace();
}
}
}
the output in web is different..
on my java output is
你的哈达哈达!
but on my the site is
ÄãµÄ¹þ´ï¹þ´ï!
Help!!

String user = new String ("boo");
You don't need to (and shouldn't) do new String in Java—String user = "boo"; is fine.
String msg = new String("你的哈达哈达!");
Writing non-ASCII characters in your source means that you have to get the -encoding flag to javac to match the encoding you have saved your text files with. It is possible you have saved the .java file as UTF-8 but not configured your build environment to use UTF-8 at compile time.
If you are not sure that you've got this right, you can use ASCII-safe \u escapes in the meantime:
String msg = "\u4F60\u7684\u54C8\u8FBE\u54C8\u8FBE!"; // 你的哈达哈达!
Finally:
URI myUrl = new URI("http://www.isms.com.my/isms_send.php?un=" + user + "&pwd=" + pass
+ "&dstno=" + dstno + "&msg=" + msg + "&type=" + type + "&sendid=" + sendid);
When you're putting a URI together you should URL-escape each of the parameters you include in the string. Otherwise any & or other invalid character in the value will break the query. This also allows you to choose what charset is used to create the query string.
String enc = "UTF-8";
URI myUrl = new URI("http://www.isms.com.my/isms_send.php?" +
"un=" + URLEncoder.encode(user, enc) +
"&pwd=" + URLEncoder.encode(pass, enc) +
"&dstno=" + URLEncoder.encode(dstno, enc) +
"&msg=" + URLEncoder.encode(msg, enc) +
"&type=" + URLEncoder.encode(Integer.toString(type), enc) +
"&sendid=" + URLEncoder.encode(sendid, enc)
);
What the right value for enc is depends on the service you are connecting to, but UTF-8 is a good guess.