Java .getInputStream() openConnection() HTTP response code ERRORS

Java .getInputStream() openConnection() HTTP response code ERRORS - java

I am trying to do the following (in Java):
connect to some proxy server & http_url some
But I am having some errors like :
java.net.ConnectException: Connection timed out: connect...
Or errors related to HTTP response code : 302, 400, FileNotFound, file server error, etc.
In some changes I did, I even got 200 code.
(when I only use openConnection() =>( without the proxy IP address).
That is my best run trace.
I have had all class of : (Unknown Source) in the error msg, from IDE Eclipse Luna console.
Some of the error come in the form / or from : .getInputStream() method, I don't know if there is about setDoInput(), setDoOutput, the Encoding, or whatever:
Can some body help me?
Here is my code:
url = new URL(http_url);
HttpURLConnection conn;
try {
conn = (HttpURLConnection)url.openConnection(proxy);
conn.setRequestMethod("GET");
conn.setRequestProperty("User-Agent", USERAGENT);
conn.setUseCaches(false);
conn.setRequestProperty("Accept", "*/*");
conn.addRequestProperty("Referer", "http://www.google.com/");
conn.setRequestProperty("Accept-Encoding", "gzip,deflate,sdch");
conn.setRequestProperty("Accept-Language", "en-US,en;q=0.8");
conn.setRequestProperty("Content-Type", "application/json; charset=UTF-8");
conn.setRequestProperty("X-Requested-With", "XMLHttpRequest");
conn.setDoInput(true);
System.out.println("response msg " + conn.getResponseMessage() + " CODE");
System.out.println("errorStream msg " + conn.getErrorStream());
System.out.println("inputStream msg " + conn.getInputStream());
String header_date = conn.getHeaderField("Date");
System.out.println(" date es: " + header_date);
String line = null;
StringBuffer tmp = new StringBuffer();
System.out.println("the code is :" + conn.getResponseCode());
if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {
BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));
while ((line = in.readLine()) != null) {
tmp.append(line);
}
System.out.println("value line is: " + line +"& date is: " + header_date);
Scrape(String.valueOf(tmp)); // temp.toString()
in.close();
in = null;
url = null;
conn.disconnect();
conn = null;
} else {
System.out.println("something bad happened code <>200, debug from your server");
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (UnsupportedEncodingException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}

To solve your Proxy problem you can try using Proxy as below
Proxy proxy= new Proxy(Proxy.Type.HTTP, new InetSocketAddress(<Proxy IP Address as String>, <Proxy Port Number as Integer>));
HttpURLConnection http_conn=(HttpURLConnection)request_url.openConnection(proxy);

Related

Statement in Catch isn't executed [duplicate]

This question already has answers here:
How to print to the console in Android Studio?
(8 answers)
Closed 5 years ago.
I need to fetch login details from my web service to authenticate login in my app. Below is the code which does the job.
try {
//Apache Libraries and namevaluepair has been deprecated since APK 21(?). Using HttpURLConnection instead.
URL url = new URL(wsURL + authenticate);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("POST");
connection.setDoOutput(true);
connection.setDoInput(true);
connection.setRequestProperty("Content-type", "application/x-www-form-urlencoded");
OutputStream os = connection.getOutputStream();
os.write(postParam.getBytes());
os.flush();
os.close();
// Fetching the response code for debugging purposes.
int responseCode = connection.getResponseCode();
Log.d(TAG, "POST Response Code: " + responseCode);
if (responseCode == HttpURLConnection.HTTP_OK) {
BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
String inputLine;
StringBuilder response = new StringBuilder();
//Adding every responseCode in the inputLine.
while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
in.close();
Log.d(TAG, "HTTP Response: " + response.toString());
//TODO: Check login logic again
//Sets Authentication flag
if (!response.toString().contains("Authentication Failed!")) {
authFlag = true;
Log.i(TAG, "Authentication Completed: Logged in Successfully!");
try {
JSONObject jsonObject = new JSONObject(response.toString());
JSONArray jsonArray = jsonObject.getJSONArray("rows");
JSONObject beanObject = jsonArray.getJSONObject(0);
userBean = new UserBean(username, beanObject.getString("User_FullName"), beanObject.getInt("UserType_Code"));
} catch (Exception e) {
e.printStackTrace();
}
}
} else {
Log.e(TAG, "Error!!! Abort!!!");
}
connection.disconnect();
} catch (MalformedURLException e) {
System.out.println("URLConnection Exception: " + e);
} catch (IOException e) {
System.out.println("IOStream Exception: " + e);
}
return postParam;
}
Issue I'm facing is I don't see anything related to it in my logcat but on debugging I find that the control goes to
} catch (MalformedURLException e) {
but System.out.println("URLConnection Exception: " + e); is never executed. I'm novice at Android dev so there might be something which I can't see. Please help.
EDIT - I first tried with Log.e but it didn't work so I put System.out.println which didn't work either.

You should not use System.out,
instead use logging functions like logcat for debugging.
In this example, considering that the catch catches an error, you should use:
private static final String TAG = "MyActivity";
...
catch (MalformedURLException e) {
Log.e(TAG, "URLConnection Exception: " + e.getMessage());
} catch (IOException e) {
Log.e(TAG, "IO error: " + e.getMessage());
}
Here is an explanation of how to use them properly.
If you can't see logcat, go there.

just try
Log.e("tag","Exception: " + e);
and you can find it in android monitor

Getting Network is unreachable on IPV6 Network

I am getting "Network is Unreachable" from below Java Http request for any url.
Below code is working fine with IPV4 network.
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setDoOutput(true);
conn.setRequestProperty("Accept", "application/json");
if (conn.getResponseCode() != 200) {
throw new RuntimeException("Failed : HTTP error code : "
+ conn.getResponseCode());
}
BufferedReader br = new BufferedReader(new InputStreamReader(
(conn.getInputStream())));
System.out.println("Output from Server .... \n");
while ((output = br.readLine()) != null) {
System.out.println(output);
}
conn.disconnect();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
Please help me on this issue.

If you are specifying the IPv6 URL using the IP address, you need to enclose it in square brackets since the :: in the address are special characters in a URL.
See RFC 2732.

HttpUrlConnection sometimes gives EOF exception

I am using HttpUrlConnection and using POST method to get some data from web server. Sometimes, I get the response and at times I get EOFexception
These are the solutions are I have already tried :
1) System.setProperty("http.keepAlive", "false");
2) if (Build.VERSION.SDK != null && Build.VERSION.SDK_INT > 13) {
connection.setRequestProperty("Connection", "close");
}
Below is my code from AsyncTask class;
CODE :
#Override
protected JSONObject doInBackground(KeyValuePair... keyValuePairs) {
JSONObject jsonResponse = new JSONObject();
HttpURLConnection connection = null;
// check if is Internet is available before making a network call
if (isInternetAvailable()) {
try {
jsonResponse = new JSONObject();
URL url = new URL(urlStr);
connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("POST");
connection.setRequestProperty("Connection", "Keep-Alive");
connection.setUseCaches(false);
connection.setDoOutput(true);
connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
connection.setRequestProperty("charset", "UTF-8");
if (Build.VERSION.SDK != null && Build.VERSION.SDK_INT > 13) {
connection.setRequestProperty("Connection", "close");
}
// setting post params
StringBuilder builder = new StringBuilder();
for (int i = 0; i < keyValuePairs.length; i++) {
builder.append(URLEncoder.encode(keyValuePairs[i].getKey(), "UTF-8") + "=" + URLEncoder.encode(keyValuePairs[i].getValue(), "UTF-8") + "&");
GeneralUtils.print("key : " + keyValuePairs[i].getKey() + ", value : " + keyValuePairs[i].getValue());
}
String postData = builder.toString();
postData = postData.substring(0, postData.length() - 1);
GeneralUtils.print("postData " + postData);
byte[] postDataByteArr = postData.getBytes();
connection.setFixedLengthStreamingMode(postDataByteArr.length);
connection.setConnectTimeout(20000);
DataOutputStream dataOutputStream = new DataOutputStream(connection.getOutputStream());
dataOutputStream.writeBytes(postData);
dataOutputStream.flush();
dataOutputStream.close();
GeneralUtils.print("respCode " + connection.getResponseCode());
// if connection was not successful
if (connection.getResponseCode() != 200) {
jsonResponse.put("status", "Failure");
jsonResponse.put("message", "Something went wrong. Please Try Again");
} else {
BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
String line = null;
StringBuilder sb = new StringBuilder();
while ((line = reader.readLine()) != null) {
sb.append(line);
}
reader.close();
String response = sb.toString();
GeneralUtils.print("NetworkCall Server response " + response);
jsonResponse = new JSONObject(response);
}
} catch (JSONException e) {
GeneralUtils.print("NetworkCall.JSONEx 162 " + e);
} catch (MalformedURLException e) {
GeneralUtils.print("NetworkCall.MalformedURLEx " + e);
} catch (IOException e) {
try {
jsonResponse.put("status", "No Internet Connection");
jsonResponse.put("message", "Please check your Internet connection and try again");
} catch (JSONException e1) {
GeneralUtils.print("NetworkCall.JSONEx " + e);
}
} finally {
connection.disconnect();
}
} else {
// if Internet is not available
try {
jsonResponse.put("status", "No Internet Connection");
jsonResponse.put("message", "Please check your Internet connection and try again");
} catch (JSONException e) {
e.printStackTrace();
}
}
return jsonResponse;
}
Many many thanks in advance!

As of now I am following a workaround posted here
which essentially dictates trying to connect N number of times to bypass the EOF exception issue.
In my case, when I catch EOFException, I call the doInBackground again depending upon the reconnectCount;
CODE :
catch (IOException e) {
try {
if (reConnectCount <= 10) {
reConnectCount++;
jsonResponse = doInBackground(keyValuePairs);
} else {
jsonResponse.put("status", "No Internet Connection");
jsonResponse.put("message", "Please check your Internet connection and try again");
}
} catch (JSONException e1) {
GeneralUtils.print("NetworkCall.JSONEx " + e);
}
}
Where jsonResponse essentially holds server response in JSON form. So, whenever doInBackground is successfully executed (i.e. does not get Caught and returns jsonResponse), we overwrite the calling doInBackground's jsonResponse object.

HTTP Request to Wikipedia gives no result

I try to fetch HTML per Code. When fetching from "http://www.google.com" for example it works perfect. When trying to fetch from "http://en.wikipedia.org/w/api.php" I do not get any results.
Does someone have any idea ?
Code:
String sURL="http://en.wikipedia.org/w/api.php?action=query&generator=categorymembers&gcmtitle=Category:Countries&prop=info&gcmlimit=500&format=json";
String sText=readfromURL(sURL);
public static String readfromURL(String sURL){
URL url = null;
try {
url = new URL(sURL);
} catch (MalformedURLException e1) {
e1.printStackTrace();
}
URLConnection urlconnect = null;
try {
urlconnect = url.openConnection();
urlconnect.setRequestProperty("User-Agent","Mozilla/5.0 (Windows NT 5.1; rv:19.0) Gecko/20100101 Firefox/19.0");
} catch (IOException e) {
e.printStackTrace();
}
BufferedReader in = null;
try {
in = new BufferedReader(new InputStreamReader(urlconnect.getInputStream()));
} catch (IOException e) {
e.printStackTrace();
}
String inputLine;
String sEntireContent="";
try {
while ((inputLine = in.readLine()) != null) {
System.out.println(inputLine);
sEntireContent=sEntireContent+inputLine;
}
} catch (IOException e) {
e.printStackTrace();
}
try {
in.close();
} catch (IOException e) {
e.printStackTrace();
}
return sEntireContent;
}

It looks like the request limit. Try to check the response code.
From the documentation (https://www.mediawiki.org/wiki/API:Etiquette):
If you make your requests in series rather than in parallel (i.e. wait
for the one request to finish before sending a new request, such that
you're never making more than one request at the same time), then you
should definitely be fine.
Be sure that you do not do few request at a time
Update
I did verification on my local your code - you are correct it does not work. Fix - you need to use https, so it would work:
https://en.wikipedia.org/w/api.php?action=query&generator=categorymembers&gcmtitle=Category:Countries&prop=info&gcmlimit=500&format=json
result:
{"batchcomplete":"","query":{"pages":{"5165":{"pageid":5165,"ns":0,"title":"Country","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-10-20T20:09:05Z","lastrevid":686706429,"length":12695},"5112305":{"pageid":5112305,"ns":14,"title":"Category:Countries by continent","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-10-18T17:31:54Z","lastrevid":681415612,"length":133},"14353213":{"pageid":14353213,"ns":14,"title":"Category:Countries by form of government","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-08-13T23:33:29Z","lastrevid":675984011,"length":261},"5112467":{"pageid":5112467,"ns":14,"title":"Category:Countries by international organization","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-10-18T05:11:12Z","lastrevid":686245148,"length":123},"4696391":{"pageid":4696391,"ns":14,"title":"Category:Countries by language","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-10-20T01:17:18Z","lastrevid":675966601,"length":333},"5112374":{"pageid":5112374,"ns":14,"title":"Category:Countries by status","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-08-13T21:05:47Z","lastrevid":675966630,"length":30},"708617":{"pageid":708617,"ns":14,"title":"Category:Lists of countries","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-10-18T05:08:45Z","lastrevid":681553760,"length":256},"46624537":{"pageid":46624537,"ns":14,"title":"Category:Caspian littoral states","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-09-23T08:40:34Z","lastrevid":663549987,"length":50},"18066512":{"pageid":18066512,"ns":14,"title":"Category:City-states","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-09-29T20:14:14Z","lastrevid":679367764,"length":145},"2019528":{"pageid":2019528,"ns":14,"title":"Category:Country classifications","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-09-25T09:09:13Z","lastrevid":675966465,"length":182},"935240":{"pageid":935240,"ns":14,"title":"Category:Country codes","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-10-17T06:05:53Z","lastrevid":546489724,"length":222},"36819536":{"pageid":36819536,"ns":14,"title":"Category:Countries in fiction","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-10-03T06:09:16Z","lastrevid":674147667,"length":169},"699787":{"pageid":699787,"ns":14,"title":"Category:Fictional countries","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-10-17T18:43:25Z","lastrevid":610289877,"length":356},"804303":{"pageid":804303,"ns":14,"title":"Category:Former countries","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-09-21T09:58:52Z","lastrevid":668632882,"length":403},"7213567":{"pageid":7213567,"ns":14,"title":"Category:Island countries","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-10-22T22:10:37Z","lastrevid":648502876,"length":157},"3046541":{"pageid":3046541,"ns":14,"title":"Category:Landlocked countries","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-10-04T00:45:24Z","lastrevid":648502892,"length":54},"743058":{"pageid":743058,"ns":14,"title":"Category:Middle Eastern countries","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-10-12T14:41:59Z","lastrevid":677900732,"length":495},"41711462":{"pageid":41711462,"ns":14,"title":"Category:Mongol states","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-10-23T07:36:21Z","lastrevid":687093637,"length":121},"30645082":{"pageid":30645082,"ns":14,"title":"Category:Country names","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-03-07T06:33:19Z","lastrevid":561256656,"length":94},"21218559":{"pageid":21218559,"ns":14,"title":"Category:Outlines of countries","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-10-07T18:04:29Z","lastrevid":645312408,"length":248},"37943702":{"pageid":37943702,"ns":14,"title":"Category:Proposed countries","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-10-20T02:30:25Z","lastrevid":668630396,"length":130},"15086044":{"pageid":15086044,"ns":14,"title":"Category:Turkic states","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-10-20T06:23:35Z","lastrevid":677424552,"length":114},"32809189":{"pageid":32809189,"ns":14,"title":"Category:Works about countries","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-10-17T08:45:32Z","lastrevid":620016516,"length":153},"27539189":{"pageid":27539189,"ns":14,"title":"Category:Wikipedia books on countries","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-04-11T05:12:25Z","lastrevid":546775798,"length":203},"35317198":{"pageid":35317198,"ns":14,"title":"Category:Wikipedia categories named after countries","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-10-17T18:35:14Z","lastrevid":641689352,"length":202}}}}
{"batchcomplete":"","query":{"pages":{"5165":{"pageid":5165,"ns":0,"title":"Country","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-10-20T20:09:05Z","lastrevid":686706429,"length":12695},"5112305":{"pageid":5112305,"ns":14,"title":"Category:Countries by continent","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-10-18T17:31:54Z","lastrevid":681415612,"length":133},"14353213":{"pageid":14353213,"ns":14,"title":"Category:Countries by form of government","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-08-13T23:33:29Z","lastrevid":675984011,"length":261},"5112467":{"pageid":5112467,"ns":14,"title":"Category:Countries by international organization","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-10-18T05:11:12Z","lastrevid":686245148,"length":123},"4696391":{"pageid":4696391,"ns":14,"title":"Category:Countries by language","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-10-20T01:17:18Z","lastrevid":675966601,"length":333},"5112374":{"pageid":5112374,"ns":14,"title":"Category:Countries by status","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-08-13T21:05:47Z","lastrevid":675966630,"length":30},"708617":{"pageid":708617,"ns":14,"title":"Category:Lists of countries","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-10-18T05:08:45Z","lastrevid":681553760,"length":256},"46624537":{"pageid":46624537,"ns":14,"title":"Category:Caspian littoral states","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-09-23T08:40:34Z","lastrevid":663549987,"length":50},"18066512":{"pageid":18066512,"ns":14,"title":"Category:City-states","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-09-29T20:14:14Z","lastrevid":679367764,"length":145},"2019528":{"pageid":2019528,"ns":14,"title":"Category:Country classifications","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-09-25T09:09:13Z","lastrevid":675966465,"length":182},"935240":{"pageid":935240,"ns":14,"title":"Category:Country codes","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-10-17T06:05:53Z","lastrevid":546489724,"length":222},"36819536":{"pageid":36819536,"ns":14,"title":"Category:Countries in fiction","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-10-03T06:09:16Z","lastrevid":674147667,"length":169},"699787":{"pageid":699787,"ns":14,"title":"Category:Fictional countries","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-10-17T18:43:25Z","lastrevid":610289877,"length":356},"804303":{"pageid":804303,"ns":14,"title":"Category:Former countries","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-09-21T09:58:52Z","lastrevid":668632882,"length":403},"7213567":{"pageid":7213567,"ns":14,"title":"Category:Island countries","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-10-22T22:10:37Z","lastrevid":648502876,"length":157},"3046541":{"pageid":3046541,"ns":14,"title":"Category:Landlocked countries","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-10-04T00:45:24Z","lastrevid":648502892,"length":54},"743058":{"pageid":743058,"ns":14,"title":"Category:Middle Eastern countries","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-10-12T14:41:59Z","lastrevid":677900732,"length":495},"41711462":{"pageid":41711462,"ns":14,"title":"Category:Mongol states","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-10-23T07:36:21Z","lastrevid":687093637,"length":121},"30645082":{"pageid":30645082,"ns":14,"title":"Category:Country names","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-03-07T06:33:19Z","lastrevid":561256656,"length":94},"21218559":{"pageid":21218559,"ns":14,"title":"Category:Outlines of countries","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-10-07T18:04:29Z","lastrevid":645312408,"length":248},"37943702":{"pageid":37943702,"ns":14,"title":"Category:Proposed countries","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-10-20T02:30:25Z","lastrevid":668630396,"length":130},"15086044":{"pageid":15086044,"ns":14,"title":"Category:Turkic states","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-10-20T06:23:35Z","lastrevid":677424552,"length":114},"32809189":{"pageid":32809189,"ns":14,"title":"Category:Works about countries","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-10-17T08:45:32Z","lastrevid":620016516,"length":153},"27539189":{"pageid":27539189,"ns":14,"title":"Category:Wikipedia books on countries","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-04-11T05:12:25Z","lastrevid":546775798,"length":203},"35317198":{"pageid":35317198,"ns":14,"title":"Category:Wikipedia categories named after countries","contentmodel":"wikitext","pagelanguage":"en","touched":"2015-10-17T18:35:14Z","lastrevid":641689352,"length":202}}}}

The reason you didn't receive the response back is due to a HTTP Redirect 3XX. Wikipedia redirects your HTTP Request. Please try the below source code to fetch Response from Redirected URL. Please refer How to send HTTP request GET/POST in Java
public static String readfromURLwithRedirect(String url) {
String response = "";
try {
URL obj = new URL(url);
HttpURLConnection conn = (HttpURLConnection) obj.openConnection();
conn.setReadTimeout(5000);
conn.addRequestProperty("Accept-Language", "en-US,en;q=0.8");
conn.addRequestProperty("User-Agent", "Mozilla");
conn.addRequestProperty("Referer", "google.com");
System.out.println("Request URL ... " + url);
boolean redirect = false;
// normally, 3xx is redirect
int status = conn.getResponseCode();
if (status != HttpURLConnection.HTTP_OK) {
if (status == HttpURLConnection.HTTP_MOVED_TEMP
|| status == HttpURLConnection.HTTP_MOVED_PERM
|| status == HttpURLConnection.HTTP_SEE_OTHER) {
redirect = true;
}
}
System.out.println("Response Code ... " + status);
if (redirect) {
// get redirect url from "location" header field
String newUrl = conn.getHeaderField("Location");
// get the cookie if need, for login
String cookies = conn.getHeaderField("Set-Cookie");
// open the new connnection again
conn = (HttpURLConnection) new URL(newUrl).openConnection();
conn.setRequestProperty("Cookie", cookies);
conn.addRequestProperty("Accept-Language", "en-US,en;q=0.8");
conn.addRequestProperty("User-Agent", "Mozilla");
conn.addRequestProperty("Referer", "google.com");
System.out.println("Redirect to URL : " + newUrl);
}
BufferedReader in = new BufferedReader(
new InputStreamReader(conn.getInputStream()));
String inputLine;
StringBuffer responseBuffer = new StringBuffer();
while ((inputLine = in.readLine()) != null) {
responseBuffer.append(inputLine);
}
in.close();
System.out.println("URL Content... \n" + responseBuffer.toString());
response = responseBuffer.toString();
System.out.println("Done");
} catch (Exception e) {
e.printStackTrace();
}
return response;
}

How to use keystone API extenstion to send a JSON format request "add global role to user "?

I want to use java to send a JSON format request to add an Admin role for openstack users, I see there is an keystone API extension that provide the "add global role to user" API:
This is the link : 2.1.1.5. Add Global roles to a user.
but I do not know how to send this in a correct way by JSON format, the following is my code:
I can get "key_admin_url" in another method,it is like: 130.237.215.18:35357/v2.0 and there is http before 130.
user_id and role_id are two strings.
//create connection
public static void addRole(){
try{
URL url = new URL(key_admin_url + "/users/" + "user_id" + "/roles/OS-KSADM/" + "role_id");
HttpURLConnection connection = (HttpURLConnection) url
.openConnection();
connection.setDoOutput(true);
connection.setDoInput(true);
connection.setRequestMethod("PUT");
connection.setUseCaches(false);
connection.setInstanceFollowRedirects(true);
connection.setRequestProperty("Content-Type",
"application/json");
connection.setRequestProperty("X-Auth-Token",
"012345SECRET99TOKEN012345");
connection.connect();
//put request
DataOutputStream out = new DataOutputStream(
connection.getOutputStream());
out.flush();
out.close();
//read response
BufferedReader reader = new BufferedReader(new InputStreamReader(
connection.getInputStream()));
String lines;
StringBuffer sb = new StringBuffer("");
while ((lines = reader.readLine()) != null) {
lines = new String(lines.getBytes(), "utf-8");
sb.append(lines);
}
System.out.println(sb);
reader.close();
// disconnect
connection.disconnect();
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
But I did not succeed and get :java.io.IOException: Server returned HTTP response code: 501 for URL:
Is there anyone know how to send a correct JSON request to add role to users? Thank you very much.

The problem has been solved, because in URI, there is no tenant_id. So the correct URI is
URL url = new URL(key_admin_url + "/tenants/" + "tenant_id" + "/users/" + "user_id" + "/roles/OS-KSADM/" + "role_id");

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