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In the last step of the OAuth2 I'm getting an error 400, so my http request is probably not formatted properly. 

I'm using java so I tried to turn the Curl command from the official documentation  into an HttpPostRequest.

(Request access token: https://developer.box.com/reference#token)

curl https://api.box.com/oauth2/token \
-d 'grant_type=authorization_code' \
-d 'code=' \
-d 'client_id=' \
-d 'client_secret=' \
-X POST

Thats my current code for it and I'm not sure where my Mistake is..

HttpClient httpclient = HttpClients.createDefault();
	HttpPost httppost = new HttpPost(url);


	List params = new ArrayList(2);
	params.add(new BasicNameValuePair("grant_type", "authorization_code"));
	params.add(new BasicNameValuePair("code",code));
	params.add(new BasicNameValuePair("client_id", ConfigAuth.client_id));
	params.add(new BasicNameValuePair("client_secret", ConfigAuth.client_secret));
	httppost.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));
					
	//Execute and get the response.
	HttpResponse response = httpclient.execute(httppost);
	HttpEntity entity = response.getEntity();
	System.out.println(response);

Long story short, I get Error 400 and I don't understand why. 

URL obj = new URL(url);
			HttpsURLConnection connection = (HttpsURLConnection) obj.openConnection();
			connection.setRequestMethod("POST");
			 connection.setRequestProperty("grant_type=","authorization_code");
			 connection.setRequestProperty("code", code);
			 connection.setRequestProperty("client_id", ConfigAuth.client_id);
			 connection.setRequestProperty("client_secret", ConfigAuth.client_secret);
			 connection.setRequestProperty("Content-Length", "100");
			 System.out.println("\nSending 'GET' request to URL : " + url);
		        System.out.println("Response code:" + connection.getResponseCode());
			        System.out.println("Response message:" + connection.getResponseMessage());
			            // Read the response:
			            BufferedReader reader = new BufferedReader(new InputStreamReader(
			            connection.getInputStream()));
			            String line;
			            StringBuffer response = new StringBuffer();
			            while ((line = reader.readLine()) != null) {
			                response.append(line);
			            }
			            reader.close();
			            System.out.println(response.toString());

 this is my second approach. Now I get Error code 411 and not 400. Any Ideas on how to fix that? I tried adding 

connection.SetRequestProperty("Content-Length", "0"); but that didn't do any good either. 

 hey there, have you considered using our SDK? A guide is available for it here.

 

https://developer.box.com/docs/authenticate-with-oauth-2

I've tried that but that didn't seem to work. 

BoxAPIConnection works with a developer token, but if I use client ID, Secret and the authorization token then it is not creating a working connection for me. So I tried requesting an actual access token so I could create a working BoxAPIConnection. If I execute the following I get an Error 400. That's why I tried a different approach. I really could use some help!

 get("/start", (req, res) -> {

			 
			  
		// Redirect user to login with Box
			String box_redirect = ConfigAuth.box_redirect
			  + "?response_type=code"
			  + "&client_id=" + ConfigAuth.client_id 
			  + "&client_secret=" + ConfigAuth.client_secret
			  + "&redirect_uri=" + ConfigAuth.redirect_uri;
				res.redirect(box_redirect);
				return "redirecting...";

				  
				  
				        		
				  
				});
			 
			 
		 get("/return", (req, res) -> {
			 // Capture auth code 
			  String code = req.queryParams("code");
			  
		System.out.println(code);
 BoxAPIConnection client = new BoxAPIConnection(ConfigAuth.client_id,ConfigAuth.client_secret,code);
				  
				  
			  BoxFolder rootFolder = BoxFolder.getRootFolder(client);
			  FileInputStream stream = new FileInputStream(ConfigAuth.file_path);
			  BoxFile.Info fileinfo = rootFolder.uploadFile(stream, "tax.txt");
			  stream.close();
			  return "Display Page"; 
			  
		 });

 

 would you be able to provide the full body error response? I'm looking for the Box request ID so I can take a look at our backend logs. Alternatively, you can open a support case with all the details so we can help you further investigate. 

I've opened a ticket with my client ID but I'm not sure where I can find the box Request ID.

 no worries! what is the ticket number? I wanna grab it so you can work with me directly. If you could also provide an example date/time/timezone you received the error that'd be most helpful! 

My ticket number: 1813690

Last time I got the error was 7.42 3rd of January 2018 (central European time)

 thank you! Let me do some digging and I'll follow up with you in the ticket. 

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