Android cUrl api - java

i am new to programming in android, i wanted to get json data from the website https://api.clashofclans.com/v1/clans in my android app.
How can i request the data in json format
curl -X GET --header 'Accept: application/json' --header "authorization: Bearer " 'https://api.clashofclans.com/v1/clans' .
i dont know how to add api key in the combination and open network connection. thanks in advance.
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setReadTimeout(10000 /* milliseconds */);
urlConnection.setConnectTimeout(15000 /* milliseconds */);
urlConnection.setRequestMethod("GET");
urlConnection.addRequestProperty("Accept","application/json");
urlConnection.addRequestProperty("authorization","my api-key here");
urlConnection.connect();
// If the request was successful (response code 200),
// then read the input stream and parse the response.
if (urlConnection.getResponseCode() == 200) {
inputStream = urlConnection.getInputStream();
jsonResponse = readFromStream(inputStream);
} else {
Log.e(LOG_TAG, "Error response code: " +
urlConnection.getResponseCode());
}
i am getting "Error response code: 403", can u tell me where my code is wrong
the api key is based on ip address.


Im sending it to my method this is where i return it as String:
public void getJson() {
String json = getJSONFromURLConnection("https://api.clashofclans.com/v1/clans?name=illuminati");
if (json != null) {
Log.i("JSON", json.toString());
}
}
Here getting all info:
private String getJSONFromURLConnection(String urlString) {
BufferedReader reader = null;
try {
URL url = new URL(urlString);
urlConnection = (HttpURLConnection) url.openConnection();
String apikey = YOUR_KEY;
urlConnection.setRequestMethod("GET");
urlConnection.addRequestProperty("Authorization", "Bearer " + apikey);
urlConnection.setRequestProperty("Accept", "application/json");
if (urlConnection.getResponseCode() == 200) {
InputStream stream = urlConnection.getInputStream();
reader = new BufferedReader(new InputStreamReader(stream));
StringBuffer buffer = new StringBuffer();
String line;
while ((line = reader.readLine()) != null) {
buffer.append(line);
}
return buffer.toString();
} else {
Log.e("Error", "Error response code: " +
urlConnection.getResponseCode());
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (urlConnection != null)
urlConnection.disconnect();
}
return null;
}
Created and tested, works for me hope you get the result you need.

Related

post request in android studio like curl

I have a question how to implement a post request in java in android studio if I have a valid request using curl:
'curl.exe anyValidUrl -d "911/21.10.2020/15.45" -H "Content-Type: text/plain"'
When sending data to the server, error 500 takes off.
Most likely I am sending data in the wrong form, where am I wrong, please tell me.
The function in which I am sending data:
{
InputStreamReader isR = null;
BufferedReader bfR = null;
StringBuilder sbRes = new StringBuilder();
HttpURLConnection urlConnection = null;
String strBody = "911/21.10.2020/15.45";
try {
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestProperty("Content-Length","" + Integer.toString(strBody.getBytes().length));
urlConnection.addRequestProperty("Content-Type","text/plain");
urlConnection.setDoOutput(true);
urlConnection.setDoInput(true);
urlConnection.setRequestMethod("POST");
DataOutputStream wr = new DataOutputStream(urlConnection.getOutputStream());
wr.writeBytes(strBody);
wr.flush();
wr.close();
urlConnection.disconnect();
} catch (Exception e) {
e.printStackTrace();
}
System.out.println( urlConnection.getRequestMethod());
if (HttpURLConnection.HTTP_OK == urlConnection.getResponseCode()) {
isR = new InputStreamReader(urlConnection.getInputStream());
bfR = new BufferedReader(isR);
String line;
while ((line = bfR.readLine()) != null) {
sbRes.append(line);
}
}
else{
return (String.valueOf(urlConnection.getResponseCode()));
}
return sbRes.toString();
}

Malformed request exception when trying to send GET request

I'm trying to connect to GDAX using their REST API.
I first want to do something very simple, i.e. getting historic rates.
I tried this:
private static final String GDAX_URL = "https://api.gdax.com";
public String getCandles(final String productId, final int granularity) {
HttpsURLConnection connection = null;
String path = "/products/" + productId + "/candles";
try {
//Create connection
URL url = new URL(GDAX_URL);
connection = (HttpsURLConnection) url.openConnection();
connection.setRequestMethod("GET");
connection.setRequestProperty("Content-Type", "application/json");
connection.setRequestProperty("granularity", String.valueOf(granularity));
connection.setUseCaches(false);
connection.setDoOutput(true);
//Send request
DataOutputStream wr = new DataOutputStream(connection.getOutputStream());
wr.writeBytes(path);
wr.close();
//Get Response
InputStream is = connection.getInputStream();
BufferedReader rd = new BufferedReader(new InputStreamReader(is));
StringBuffer response = new StringBuffer();
String line;
while ((line = rd.readLine()) != null) {
response.append(line);
response.append('\r');
}
rd.close();
System.out.println(response.toString());
} catch (Exception e) {
e.printStackTrace();
return null;
} finally {
if (connection != null) {
connection.disconnect();
}
}
return null;
}
But I get a 400 code in return "Bad Request – Invalid request format".
My problem is with the passing of the path "/products//candles" and the parameters (e.g. granularity).
I don't understand what should go in the request properties and in the message itself, and in what form.

I managed to make it work like this:
URL url = new URL(GDAX_URL + path + "?granularity="+granularity);
connection = (HttpsURLConnection) url.openConnection();
connection.setRequestMethod("GET");
connection.setRequestProperty("Content-Type", "application/json");
Not sure how to use the DataOutputStream, so I just removed it. At least it works.

HttpURLConnection - Response Code: 400 (Bad Request) Android Studio -> xserve

So I'm trying to connect to our database via Xserve, AT the moment I'm trying to access the token for the user. I'm using the correct username and password along with the context type and grant type; I know this because I've tried the same POST method via googles postmaster extension. For whatever reason when I try the same thing on Android, at least what I think is the same, it gives me a 400 response code and doesn't return anything.
Here's the code used to connect:
private HttpURLConnection urlConnection;
#Override
protected Boolean doInBackground(Void... params) {
Boolean blnResult = false;
StringBuilder result = new StringBuilder();
JSONObject passing = new JSONObject();
try {
URL url = new URL("http://xserve.uopnet.plymouth.ac.uk/modules/INTPROJ/PRCS251M/token");
// set up connection
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setDoInput(true);
urlConnection.setDoOutput(true);
urlConnection.addRequestProperty("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8" );
urlConnection.setRequestMethod("POST");
urlConnection.connect();
// set up parameters to pass
passing.put("username", mEmail);
passing.put("password", mPassword);
passing.put("grant_type", "password");
// add parameters to connection
OutputStreamWriter wr= new OutputStreamWriter(urlConnection.getOutputStream());
wr.write(passing.toString());
// If request was good
if (urlConnection.getResponseCode() == 200) {
blnResult = true;
BufferedReader reader = new BufferedReader(
new InputStreamReader(urlConnection.getInputStream()));
String line;
while ((line = reader.readLine()) != null) {
result.append(line);
}
reader.close();
}
//JSONObject json = new JSONObject(builder.toString());
Log.v("Response Code", String.format("%d", urlConnection.getResponseCode()));
Log.v("Returned String", result.toString());
}catch( Exception e) {
e.printStackTrace();
}
finally {
urlConnection.disconnect();
}
return blnResult;
}
I haven't stored the result into the JSONObject yet as I'll use that later, but I expected some kind of output via the "Log.v".
Is there anything that stands out?

try {
URL url = new URL("http://xserve.uopnet.plymouth.ac.uk/modules/INTPROJ/PRCS251M/token");
parameters = new HashMap<>();
parameters.put("username", mEmail);
parameters.put("password", mPassword);
parameters.put("grant_type", "password");
set = parameters.entrySet();
i = set.iterator();
postData = new StringBuilder();
for (Map.Entry<String, String> param : parameters.entrySet()) {
if (postData.length() != 0) {
postData.append('&');
}
postData.append(URLEncoder.encode(param.getKey(), "UTF-8"));
postData.append('=');
postData.append(URLEncoder.encode(String.valueOf(param.getValue()), "UTF-8"));
}
postDataBytes = postData.toString().getBytes("UTF-8");
// set up connection
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setDoInput(true);
urlConnection.setDoOutput(true);
urlConnection.setConnectTimeout(5000);
urlConnection.setReadTimeout(5000);
urlConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded;charset=UTF-8");
urlConnection.setRequestMethod("POST");
urlConnection.getOutputStream().write(postDataBytes);
// If request was good
if (urlConnection.getResponseCode() == HttpURLConnection.HTTP_OK) {
reader = new BufferedReader(
new InputStreamReader(urlConnection.getInputStream()));
String line;
while ((line = reader.readLine()) != null) {
result.append(line);
}
reader.close();
}
Log.v("Login Response Code", String.valueOf(urlConnection.getResponseCode()));
Log.v("Login Response Message", String.valueOf(urlConnection.getResponseMessage()));
Log.v("Login Returned String", result.toString());
jsonObject = new JSONObject(result.toString());
token = jsonObject.getString("access_token");
} catch (Exception e) {
e.printStackTrace();
} finally {
urlConnection.disconnect();
if (token != null) {
jsonObject = driverInfo(token);
}
}
this works, although I've moved it to it's own function now.
changed the input type to a HashMap

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;
}

Flask not receiving POST from Android

I used to use DefaultHttpClient for my networking code, but decided to change to HttpURLConnection.
I have searched for other questions on how to send POST messages (eg How to add parameters to HttpURLConnection using POST), but for some reason my Flask app always gives me error 400.
When I use logcat, it indeed displays that my POST message is "username=asdf&password=asdf". I include the code below. Also, if I initialized the cookieManager in the method that called this method (makeServiceCall), will returning cookieManager keep my session for subsequent calls to makeServiceCall?
public CookieManager makeServiceCall(CookieManager cookieManager, String urlString, int method, List<NameValuePair> db) {
String charset = "UTF-8";
try {
URL url = new URL(urlString);
if (method == POST) {
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
if (db != null) {
try {
urlConnection.setDoInput(true);
urlConnection.setDoOutput(true);
urlConnection.setChunkedStreamingMode(0);
urlConnection.setRequestMethod("POST");
urlConnection.setRequestProperty("Accept-Charset", charset);
urlConnection.setRequestProperty("Content-Type",
"application/x-www-form-urlencoded");
OutputStream out = new BufferedOutputStream(urlConnection.getOutputStream());
BufferedWriter writer = new BufferedWriter(
new OutputStreamWriter(out, charset));
Log.d("log", "> " + getQuery(db));
writer.write(getQuery(db));
writer.flush();
writer.close();
out.close();
//Get Response
InputStream in = urlConnection.getInputStream();
BufferedReader rd = new BufferedReader(new InputStreamReader(in));
String line;
StringBuffer response = new StringBuffer();
while((line = rd.readLine()) != null) {
response.append(line);
response.append('\r');
}
rd.close();
Log.d("Read attempt: ", "> " + response.toString());
}
finally {
urlConnection.disconnect();
}
}
}
etc.
Flask code:
def login():
error = None
if request.method == 'POST':
if request.form['username'] != app.config['USERNAME']:
error = 'Invalid username'
elif request.form['password'] != app.config['PASSWORD']:
error = 'Invalid password'
else:
session['logged_in'] = True
flash('You were logged in')
return redirect(url_for('show_entries'))
return render_template('login.html', error=error)

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