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PATCH Request in Java using MSAL (msal-client-credential-secret)

I'm using client credential secret to run API on Microsoft Endpoint (Intune).
Example used from link.
Getting access token. (Working)
Get android Managed App Protections. (Working using GET HTTP Method)
Patch Request. (Not Working)
The examples do not mention any PATCH or POST request, hence need some help for it.
I tried the below code snippet but it fails.
private void setAndroidModels(final String accessToken, final String policyId, final String modelList)
throws IOException {
URL url = new URL(
"https://graph.microsoft.com/beta/deviceAppManagement/androidManagedAppProtections/" + policyId);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("PATCH");
conn.setRequestProperty("Authorization", "Bearer " + accessToken);
conn.setRequestProperty("Accept", "application/json");
conn.setDoOutput(true);
try (OutputStream os = conn.getOutputStream()) {
byte[] input = modelList.getBytes();
os.write(input, 0, input.length);
}
int httpResponseCode = conn.getResponseCode();
System.out.println("POST Response Code : " + httpResponseCode);
System.out.println("POST Response Message : " + conn.getResponseMessage());
}
Result : Exception in thread "main" java.net.ProtocolException: Invalid HTTP method: PATCH
Also tried
private void setAndroidModels(final String accessToken, final String policyId, final String modelList)
throws IOException {
URL url = new URL(
"https://graph.microsoft.com/beta/deviceAppManagement/androidManagedAppProtections/" + policyId);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestProperty("X-HTTP-Method-Override", "PATCH");
conn.setRequestMethod("POST");
conn.setRequestProperty("Authorization", "Bearer " + accessToken);
conn.setRequestProperty("Accept", "application/json");
conn.setDoOutput(true);
try (OutputStream os = conn.getOutputStream()) {
byte[] input = modelList.getBytes();
os.write(input, 0, input.length);
}
int httpResponseCode = conn.getResponseCode();
System.out.println("POST Response Code : " + httpResponseCode);
System.out.println("POST Response Message : " + conn.getResponseMessage());
}
Result :
POST Response Code : 400
POST Response Message: Bad Request
How can I get the client credential secret logic working for POST and PATCH HTTP Methods?

We can directly call patch request in MS Graph.
When creating PATCH requests to the API, you need to create a new
PATCH object that contains only the information you want to update.
This should be distinct from any objects you receive from the service
from a GET or a POST.
Please refer Document for more details.
For example, Patch rquest to user
User realMe = graphClient.me().buildRequest().get();
User patchMe = new User();
patchMe.givenName = "Beth";
realMe = graphClient
.users(realMe.userPrincipalName)
.buildRequest()
.patch(patchMe);

Google Firebase HTTP Post

I'm trying to request POST for Google Firebase in server. I followed the document guideline, but it has not worked.
My sending message function is following thing.
private static void sendMsg() throws IOException
{
String url = "https://fcm.googleapis.com/fcm/send";
URL obj = new URL(url);
HttpURLConnection con = (HttpURLConnection) obj.openConnection();
con.setRequestMethod("POST");
con.setRequestProperty("Content-Type", "application/json");
con.setRequestProperty("Authorization", "key=XXXX");
JSONObject msg=new JSONObject();
msg.put("message","test8");
JSONObject parent=new JSONObject();
parent.put("to", "XXXXX");
parent.put("data", msg);
con.setDoOutput(true);
int responseCode = con.getResponseCode();
System.out.println("\nSending 'POST' request to URL : " + url);
System.out.println("Post parameters : " + parent.toString());
System.out.println("Response Code : " + responseCode+" "+con.getResponseMessage());
}
The response code is "411" and the message is "Length Required".
I also tried to set the content length, but the result was same.
Am I doing wrong?

You have all the setup right but are not writing the data. Add the statements shown:
con.setDoOutput(true);
// Added
OutputStreamWriter os = new OutputStreamWriter(con.getOutputStream());
os.write(parent.toString());
os.flush();
os.close();

How to use HTML response to extract data in Java?

So, when I am sending an HTTP request using Java language, am getting the response in the form of HTML code. For example, sending request: http://www.google.com/search?q=what%20is%20mango
getting the response in the form of HTML code of this page:
https://www.google.co.in/search?q=what+is+mango&rlz=1C1CHBF_enIN743IN743&oq=what+is+mango&aqs=chrome..69i57j0l5.4095j0j7&sourceid=chrome&ie=UTF-8
So, from this response page, I again want to send the request to Wikipedia page (listed in the response page) and then I want to copy the content about mango from the Wikipedia page and write it to a file on my system
the code from which I am sending the Google search request:
package api_test;
import java.io.*;
import java.net.*;
import java.util.*;
public class HttpURLConnectionExample {
private final String USER_AGENT= "Mozilla/5.0";
public static void main(String[] args) throws Exception {
HttpURLConnectionExample http= new HttpURLConnectionExample();
System.out.println("testing 1- send http get request");
http.sendGet();
}
private void sendGet() throws Exception{
Scanner s= new Scanner(System.in);
System.out.println("enter the URL");
String url = s.nextLine();
URL obj = new URL("http://"+url);
HttpURLConnection con = (HttpURLConnection) obj.openConnection();
// optional default is GET
con.setRequestMethod("GET");
//add request header
con.setRequestProperty("User-Agent", USER_AGENT);
int responseCode = con.getResponseCode();
System.out.println("\nSending 'GET' request to URL : " + url);
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();
//print result
System.out.println(response.toString());
}
}

I think what you need is a HTML Parser, like jsoup.
You could do something like
Document doc = Jsoup.connect("http://www.google.com/search?q=what%20is%20mango").get();
Element result = doc.select("#search h3.r a").first();
String link = result.attr("data-href");
I'm not sure if Google's layout changes a lot, but right now the CSS selector "#search h3.r a" is working.

Server returned HTTP response code: 415 Unsupported media type

I have a rest web service like below.
#POST
#Path("/startProcess")
#Produces(MediaType.TEXT_PLAIN)
#Consumes(MediaType.APPLICATION_JSON)
public String startProcess(InputParams inputParams, #Context HttpServletRequest request, #Context HttpServletResponse response) {
ProjectBean projBean = new ProjectBean();
Helper.loadProjectBean(inputParams, projBean);
return "1";
}
Now I am trying to consume it with below main program.
public static void main(String[] args) throws Exception {
StringBuffer response = new StringBuffer();
String taigaServiceUrl = "http://localhost:8181/restServer/rest/TestWebService/startProcess/";
URL url = new URL(taigaServiceUrl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
conn.setDoOutput(true);
conn.setRequestProperty("Content-Type", "application/json");
String userpass = "admin" + ":" + "admin";
String basicAuth = "Basic " + new String(new Base64().encode(userpass.getBytes()));
conn.setRequestProperty("Authorization", basicAuth);
InputParams inputParams = new InputParams();
inputParams.setXXX("xxxx");
inputParams.setYYYY("123456");
inputParams.setZZZZ("ZZZZ");
String json = new Gson().toJson(inputParams);
DataOutputStream os = new DataOutputStream (conn.getOutputStream());
os.write(json.getBytes());
os.flush();
BufferedReader br = new BufferedReader(new InputStreamReader((conn.getInputStream())));
String inputLine;
while ((inputLine = br.readLine()) != null) {
response.append(inputLine);
}
br.close();
}
But every time I am getting below error.
Exception in thread "main" java.io.IOException: Server returned HTTP response code: 415 for URL: http://localhost:8181/restServer/rest/TestWebService/startProcess/
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at scm.controllers.Test.main(Test.java:64)
As per error the media type is unsupported. In my rest webservice I am consuming JSON and in my main program I am sending JSON. Then where it is breaking?

Well after lot of debugging I found solution of my problem. I needed to add below jars in classpath. Actually Jersey was not able to bind JSON object to the rest service.
jackson-annotations-2.5.4.jar
jackson-core-2.5.4.jar
jackson-databind-2.5.4.jar
jackson-jaxrs-base-2.5.4.jar
jackson-jaxrs-json-provider-2.5.4.jar
jersey-entity-filtering-2.22.2.jar
jersey-media-json-jackson-2.22.2.jar

Have a look at this guide:
I think you need to define a json processor:
https://www.nabisoft.com/tutorials/java-ee/producing-and-consuming-json-or-xml-in-java-rest-services-with-jersey-and-jackson
thanks.

This is the issue with your #Produces and #Consumes.
#Produces(MediaType.TEXT_PLAIN)
#Consumes(MediaType.APPLICATION_JSON)
As per the annotation, your endpoint receives JSON and result would be TEXT.
But in your client program, you have mentioned content type as json.
conn.setRequestProperty("Content-Type", "application/json");
Hence client expects a json, where as its not.
Change this as
conn.setRequestProperty("Content-Type", "text/plain");
would work.

HttpsUrlConnection with Authorization seems to cut off url parameter in GET request

I'm trying to establish a Connection via HTTPS. I also set the "Authorization" property in the Request Header to Basic and provide an encoded auth string accordingly.
I checked with the Firefox Plugin HttpRequester and everythign works fine, which means I entered the url, choose "GET" as request method, add the Authorization to the header and after pressing submit I get back some xml which only a properly authorized user should get.
Unfortunately I can neither provide you with the actual auth info nor the real url in the SSCCE. However, I can tell you, that the Auth seems to work, since I get a 200 response. I also changed the Auth to a wrong value and get a "401 Authorization Required" response then.
It actually seems like the "?myparam=xyz" is somehow cut off, because when I remove this parameter from the url and test with Firefox HttpRequester again I get the same response as in Java.
Unfortunately I have no access to "theirdomain.com", so I don't know what's happending on the server side. But since it works with the Firefox HttpRequester, it should also work with Java.
What could be the reason? Thanks for your help!
EDIT:
I changed the url to "https://www.google.com/search?q=foo" and commented this line:
//con.setRequestProperty("Authorization", auth);
I can see from the returned string, that google received the "foo". So apparently the combination of Authorization and get parameter seems to be the problem, since both separately work fine.
SSCCE:
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import javax.net.ssl.HttpsURLConnection;
public class HttpRequest
{
/**
* #param args
*/
public static void main(final String[] args)
{
System.out.println("start request");
final String urlString = "https://theirdomain.com/foo/bar/bob?myparam=xyz";
final String auth = "Basic XyzxYzxYZxYzxyzXYzxY==";
HttpsURLConnection con;
try
{
final URL url = new URL(urlString);
con = (HttpsURLConnection) url.openConnection();
con.setRequestProperty("Authorization", auth);
con.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:25.0) Gecko/20100101 Firefox/25.0");
con.setRequestMethod("GET");
// con.setDoOutput(true);
con.connect();
final int responseCode = con.getResponseCode();
if (responseCode != 200)
System.out.println("Server responded with code " + responseCode + " " + con.getResponseMessage());
else
{
System.out.println("Starting to read...");
final InputStream inStream = con.getInputStream();
final ByteArrayOutputStream baos = new ByteArrayOutputStream();
int c;
while (inStream != null && (c = inStream.read()) != -1)
{
baos.write(c);
}
System.out.println(new String(baos.toByteArray()));
}
}
catch (final IOException e)
{
System.out.println("could not open an HTTP connection to url: " + urlString);
e.printStackTrace();
}
finally
{
System.out.println("end request");
}
}
}

Have you tried adding
con.setRequestProperty("myparam", "xyz"); to your code?