I'm developing an android app which connects to backend server via HTTPS. Everything is working properly when I use mobile data - no errors and other similar things. However, when I turn on WiFi and try to get some data from backend server I'm getting large delays (even 40 seconds) although I download just two lines of text, for example. I've also noticed that if I connect to backend server via HTTP, there is no problem using both mobile data and WiFi. I have tested many times if I set up SSL protocol properly and everything seems to be done properly.
I'm providing to you a piece of code, which is responsible for connecting with backend server from the app:
private boolean downloadData() {
try {
URI uri = new URI("https://www.example.com/resources/script/get_data.php");
HttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(uri);
httpPost.setHeader("Cache-Control", "no-cache, no-store, must-revalidate");
httpPost.setHeader("Pragma", "no-cache");
HttpResponse httpResponse = httpClient.execute(httpPost);
String result = EntityUtils.toString(httpResponse.getEntity());
if(result.equals("error")) {
return false;
}
result = result.replaceAll("\"", "\\\"");
JSONArray jsonArray = new JSONArray(result);
// code which receive and parse data from JSON
return true;
} catch (URISyntaxException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
}
return false;
}
If you want to get some more information/pieces of code, write in comments.
Thanks for your help
You need to trace you requests by some monitoring program. After that you can see what node creates a delay. And pls show this data.
I'm have the following code which I seem to be experiencing random image reading failure with with no exceptions. I'm running the following image url in a batch job, some of the other urls work some don't. The failure is ImageIO.read is null although it's a perfectly good working url. The url posted is the one I was experiencing the failure with. Anybody know what might be causing this code to fail.
I'd also like to say I'm using Java 8 as well.
try {
URL url;
url = new URL("https://content.homenetiol.com/672/27185/640x480/4d352f4ff9cf4948a93612e91401e128.jpg");
BufferedImage sourceImg = ImageIO.read(url);
System.out.println(sourceImg);
} catch (MalformedURLException ex) {
System.out.println("MalformedURLException " + ex.getMessage());
} catch (IOException ex) {
System.out.println("IOException " + ex.getMessage());
}
also a working url
https://content.homenetiol.com/672/27185/640x480/49a9236f2196432db81e477fde44e756.jpg
I'm pretty sure from mucking around with curl that the server occasionally responds with 302 redirect response that the standard Java URL doesn't handle.
Here is some code that uses Apache HttpClient to fetch the image, and works even when the server responds with a 302 redirect:
try (CloseableHttpClient httpclient = HttpClients.createDefault()) {
HttpGet httpget = new HttpGet("https://content.homenetiol.com/672/27185/640x480/4d352f4ff9cf4948a93612e91401e128.jpg");
try (CloseableHttpResponse response = httpclient.execute(httpget);
InputStream stream = response.getEntity().getContent()) {
BufferedImage sourceImg = ImageIO.read(stream);
System.out.println(sourceImg);
}
} catch (IOException e) {
e.printStackTrace();
}
I am working on an app that is supposed to go out and grab analytics data from a users YouTube account.
I am able to retrieve the authorization code from Google using the below url inside a webview in my app.
https://accounts.google.com/o/oauth2/auth?scope=https://www.googleapis.com/auth/yt-analytics.readonly&approval_prompt=force&redirect_uri=urn:ietf:wg:oauth:2.0:oob&response_type=code&client_id=762546229188.apps.googleusercontent.com&access_type=offline
I retrieve the code from the title of the page and then cut off the success using Java's substring method.
However, when I go to get the access token it will only return "error" : "invalid_grant"
HttpClient client = new DefaultHttpClient(); //new HTTP client
HttpPost post = new HttpPost("https://accounts.google.com/o/oauth2/token"); //where to post to
List<NameValuePair> pairs = new ArrayList<NameValuePair>(); //construct the values to hand to Google
Log.v("KUZMA", arg0[0]); //personal logcat message
pairs.add(new BasicNameValuePair("code", arg0[0])); //in arg0[0] lives the auth code
pairs.add(new BasicNameValuePair("client_id", CLIENT_ID)); //I store the Client_id as a static variable at the beginning of my class
//Log.v("Kuzma", CLIENT_ID);
//pairs.add(new BasicNameValuePair("client_secret", "*******"));
pairs.add(new BasicNameValuePair("redirect_uri", "http://localhost"));
pairs.add(new BasicNameValuePair("grant_type", "authorization_code")); //Leave this line how it is
String responseBody = null;
try {
post.setEntity(new UrlEncodedFormEntity(pairs));
org.apache.http.HttpResponse response = client.execute(post);
responseBody = EntityUtils.toString(response.getEntity());
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Log.v("KUZMA", responseBody); // That just logs it into logCat
//output.setText("something happened?");
return null;
So I guess my biggest issue is that I don't have a client secret but it is not provided to me by Google for an installed application. Is there a way around this? I have also played with Google Play Services and can't get that working either, but if you know how that works that would be great too!
Although you don’t say it, this looks like an Android App. So you need to go use GoogleAuthUtil to give you the token for the scope; start here: http://developer.android.com/google/play-services/auth.html
Authentication error: Unable to respond to any of these challenges: {} Android - 401 Unauthorized
I have taken reference from this link
Authentication Error when using HttpPost with DefaultHttpClient on Android
I am working on android app in that backed in Drupal. In that I am sending data from android app to drupal website - webservice in JSON format. Now I can read JSON data from Drupal webservice and writing it in my android application. But facing problem in writing on drupal from android, it generates response with status code
401 Unauthorized
From android native app it generates 401 , while from phonegap-from android when I initiate AJAX request it works perfectly & writes an article or page on drupal website. so that means webservice work perfectly &
my phonegap android app works perfectly there is problem with Android native JAVA application
I am running my android application on Android2.3.4 -> Samsung Galaxy
S Plus - Samsung GT-I9001
here is my code for java android.
==============================
String url = "XXX";
strResponse1 = makeWebForPostIdea(url,title,body);
public static String makeWebForPostIdea(String url, String title,String body)
{
JSONStringer jsonobject = null;
JSONObject json = null;
JSONObject jsonnode = null;
DefaultHttpClient client = new DefaultHttpClient();
Credentials creds = new UsernamePasswordCredentials("username", "password");
client.getCredentialsProvider().setCredentials(new AuthScope(AuthScope.ANY_HOST, AuthScope.ANY_PORT), creds);
HttpPost post = new HttpPost(url);
System.out.println("value of the post =============> "+post);
try {
JSONObject jsonvalue = new JSONObject();
jsonvalue.put("value", body.toString());
JSONArray array = new JSONArray();
array.put(jsonvalue);
jsonnode = new JSONObject();
jsonnode.put("und", array);
System.out.println("######2 jsonnode=======>"+jsonnode.toString());
} catch (JSONException e3) {
// TODO Auto-generated catch block
e3.printStackTrace();
}
try {
jsonobject = new JSONStringer().array().object().key("und").object().key("0").object().key("value").value(body).endObject().endObject().endObject().endArray();
System.out.println("=============>"+jsonobject);
} catch (JSONException e2) {
// TODO Auto-generated catch block
e2.printStackTrace();
}
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("type","page"));
params.add(new BasicNameValuePair("title",title));
params.add(new BasicNameValuePair("language","und"));
params.add(new BasicNameValuePair("body",jsonobject.toString()));
System.out.println("value of the params =============> "+params);
UrlEncodedFormEntity formEntity = null;
try {
formEntity = new UrlEncodedFormEntity(params);
} catch (UnsupportedEncodingException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
post.setEntity(formEntity);
try {
HttpResponse response = client.execute(post);
int statusCode = response.getStatusLine().getStatusCode();
System.out.println("=========> statusCode post idea=====> "+statusCode);
if (statusCode == HttpStatus.SC_OK)
{
HttpEntity entity = response.getEntity();
InputStream is = entity.getContent();
return iStream_to_String(is);
}
else
{
return "Hello This is status ==> :"+String.valueOf(statusCode);
}
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
public static String iStream_to_String(InputStream is1) {
BufferedReader rd = new BufferedReader(new InputStreamReader(is1), 4096);
String line;
StringBuilder sb = new StringBuilder();
try {
while ((line = rd.readLine()) != null) {
sb.append(line);
}
rd.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
String contentOfMyInputStream = sb.toString();
return contentOfMyInputStream;
}
}
}
here is the logcat that I am getting.
08-09 12:41:29.063: I/System.out(336): value of the post =============> org.apache.http.client.methods.HttpPost#4053c3c8
08-09 12:41:29.093: I/System.out(336): ######2 jsonnode=======>{"und": [{"value":"ddddddd"}]}
08-09 12:41:29.093: I/System.out(336): =============>[{"und":{"0":{"value":"ddddddd"}}}]
08-09 12:41:29.103: I/System.out(336): value of the params =============> [type=page, title=hhhh, language=und, body=[{"und":{"0":{"value":"ddddddd"}}}]]
08-09 12:41:30.913: W/DefaultRequestDirector(336): Authentication error: Unable to respond to any of these challenges: {}
08-09 12:41:30.913: I/System.out(336): =========> statusCode post idea=====> 401
08-09 12:41:30.924: I/System.out(336): =========> Response from post idea => Hello This is status ==> :401
Here is my PhoneGap Ajax request it works perfectly.
$('#page_node_create_submit').live('click',function(){
var title = $('#page_node_title').val();
//if (!title) { alert('Please enter a title.'); return false; }
var body = $('#page_node_body').val();
//if (!body) { alert('Please enter a body.'); return false; }
// BEGIN: drupal services node create login (warning: don't use https if you don't have ssl setup)
$.ajax({
url: "XXX",
type: 'post',
data: 'node[type]=page&node[title]=' + encodeURIComponent(title) + '&node[language]=und&node[body][und][0][value]=' + encodeURIComponent(body),
dataType: 'json',
error: function(XMLHttpRequest, textStatus, errorThrown) {
alert('page_node_create_submit - failed to login');
console.log(JSON.stringify(XMLHttpRequest));
console.log(JSON.stringify(textStatus));
console.log(JSON.stringify(errorThrown));
},
success: function (data) {
$.mobile.changePage("index.html", "slideup");
}
});
// END: drupal services node create
return false;
});
=================================================================================
Edit :
I have tried various methods for Apache httpclient for my error.During this time I have done some research and searched on google and found out some interesting stuff.
1st thing that I found it that Android-Google Officially does not recommend Apache HttpClient that I am using in my code. Check this link. In that Link message from Jesse Wilson from the Dalvik team. In that they suggest to use HttpURLConnection instead of DefaultHttpClient and also written that Android team will no longer develop Apache httpclient . so its the older version that I am using.
http://android-developers.blogspot.in/2011/09/androids-http-clients.html
2nd thing that I have found form this link. It suggests that Android is shipping with Apache's HttpClient 4.0 Beta2, which has a pitfall, when it comes to Basic Authentication. The Authentication method that I am using is of HttpClient 3.x , that I have found out from this link.
check the link.
http://hc.apache.org/httpclient-3.x/authentication.html#Preemptive_Authentication
So the version issue.
http://dlinsin.blogspot.in/2009/08/http-basic-authentication-with-android.html
I have also found some links with potential solution of this problem.
http://ogrelab.ikratko.com/using-newer-version-of-httpclient-like-4-1-x/
Apache HttpClient 4.1 on Android
What version of Apache HTTP Client is bundled in Android 1.6?
From these links , I made a conclusion that if we upgrade the Apache HttpClient to latest stable version , then this problem can be solved.
But this is directly no possible , as Android Team has officially stopped the support for the Apache httpclient.
With this link It could be possible to solve. I have not tried it but I am working on it.
It is the library that can help in upgrading httpclient version in Android.
http://code.google.com/p/httpclientandroidlib/
The other solution could be using HttpURLConnection .I am also working on it.
But most people here on stackoverflow and Internet seems to using DefaultHttpCLient with Android. And ofcourse it is also working with me throughout my application including login,registration,reading from server and session and other functionality.Just it is not working with directly post some article to my server-Drupal website.
It works perfectly with POST request during registration of user on server.
So friends , any suggestions regarding this ? why it is not working just with posting article ?
How come it works from the PhoneGap but not Java. PhoneGap runs the app in a web container and so already has been authenticated - and you have all the right cookies. AJAX will share the same session that and everything 'just works'.
However HTTPClient is a completely different - you are initiating a brand new HTTP session and everything has to be right.
A few comments on how HTTP Auth works:
There are several HTTP authentication methods - and it's the web server that chooses which. Before going any further, check your Drupal configuration to work out whether it is:
Basic Auth (username and password). Everyone and their dog supports this, but it's very insecure. See http://en.wikipedia.org/wiki/Basic_access_authentication for more details
Digest (username and challenge/response hash with MD5. This is more secure but much more complex. Note that MD5 is generally considered weak now. Many libraries support it, including Apache. See http://en.wikipedia.org/wiki/Digest_access_authentication for more details
NTLM (a variant of Kerberos/SPEGNO) which is implemented on IIS. This is not generally supported from Java, although HTTPClient does profess to - but using a different Credentials object. See http://hc.apache.org/httpclient-3.x/authentication.html#NTLM
(Note also that the web container has the 'smarts' to be able to try different authentication methods as requested by the server, all behind the scenes)
Also check the Drupal web logs. A few pointers:
Did you see the HTTPClient connect at all. And is the URL going to the correct resource. Always worth checking from the server's perspective...
Did it go to the right server? One example of what could go wrong: Are you using IP
addresses in the URL against a multi-homed web server, so the request goes to the wrong server?
Check that the authentication sent by the client pre-emptively is the correct type (basic, digest, NTLM)
Let me know if this helps. If not, and you can give more details as per this post, I can follow up with more advice.
You might try to check: How to do http post using apache httpclient with web authentication?
It uses a HttpInterceptor to inject the authentication data, when required
I'd suggest to test first the PHP side out the app. There are several ways to make your own calls including headers and auth. From curl to GraphicalHttpClient (http://itunes.apple.com/us/app/graphicalhttpclient/id433095876?mt=12 , I personally use that and it works decently). There some other options like REST client debugger (https://addons.mozilla.org/en-US/firefox/addon/restclient/)
This way you'll be able to test your call in so many ways which is pain doing directly in the client (sometimes it's just changing from http to https or adding the type of your token in the Authorization header and that's much easier to be madeo n the fly).
Once everything works as expected, reproduce the same call, headers and body in your client and you are ready to go.
I was running into the same "DefaultRequestDirector: Authentication error: Unable to respond to any of these challenges: {}" problem with Drupal services using the loopj android-async-http library (highly recommend it).
The key to the solution for me was in Jose L Ugia's comment in one of the answers regarding paying special attention to the JSON output from Drupal. I was trying to catch a JSONObject but the real message was in array format "["Wrong username or password."]". Switching to JSONArray caught the error properly and allowed me to handle it. In your case I believe it is because you are not posting the login credentials as drupal services expects it.
You should remember with Drupal Services you should do system/connect and grab the session, followed by user/login (and the user/password passed in as parameters) and grab the session and then all your subsequent requests should work. This is why I like using the loopj library because it makes all these requests more manageable. Here is a very basic example of connecting to drupal with loopj. All subsequent posts are easily done using the params.
public class Loopj {
private static final String TAG = "loopj";
private static AsyncHttpClient client = new AsyncHttpClient();
private final PersistentCookieStore myCookieStore;
public Loopj(Context context) {
myCookieStore = new PersistentCookieStore(context);
client.setCookieStore(myCookieStore);
client.addHeader("Content-type", "application/json");
}
public void systemConnect(String uri) throws JSONException {
client.post(uri + "/endpoint/system/connect", new JsonHttpResponseHandler() {
#Override
public void onSuccess(JSONObject json) {
Log.i("TAG", "Connect success =" + json.toString());
}
#Override
public void onFailure(Throwable e, String response) {
Log.e("TAG", "Connect failure");
}
});
}
public void userLogin(String uri) throws JSONException {
RequestParams params = new RequestParams();
params.put("username", username);
params.put("password", password);
client.post(uri + "/endpoint/user/login", params, new JsonHttpResponseHandler() {
#Override
public void onSuccess(JSONArray response) {
Log.i("TAG", "Login success =" + response.toString());
}
#Override
public void onFailure(Throwable e, JSONArray json) {
Log.e("TAG", "Login failure");
}
});
}
I'm trying to issue a post request to my django webserver (which behaves correctly when accessed via browser)
my post code:
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://23.23.237.174/save-item");
try {
// Add your data
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("user_email", WeShouldActivity.ACCOUNT_NAME));
for (Field f : mData.keySet()) {
nameValuePairs.add(new BasicNameValuePair(f.getName(), mData.get(f)));
}
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
// Execute HTTP Post Request
HttpResponse response = httpclient.execute(httppost);
Log.v("GETREFERRALSSERVICE", "backing up items");
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
Log.v("GETREFERRALSSERVICE", e.getMessage());
} catch (IOException e) {
// TODO Auto-generated catch block
Log.v("GETREFERRALSSERVICE", e.getMessage());
}
my complete error in apache2/access.log (nothing shows up in error.log)
174.253.199.12 - - [16/May/2012:03:25:15 +0000] "POST /save-item HTTP/1.1" 500 53055 "-" "Apache-HttpClient/UNAVAILABLE (java 1.4)"
Does anyone have any idea what this might be/how to fix?
NOTE: this IS an error. The request is not getting through to my view, where it does with the exact same url in a browser. I'm printing out the request first thing in my view and nothing shows up in error.log
'Apache-HttpClient/UNAVAILABLE (java 1.4)' is just the Android user agent string, not an error message. Something is wrong on the server side, you should try to debug it by adding logging, etc. Does the server side require authentication? If so, you might be missing a session cookie, etc.
BTW, since it seems you are adding more than two items, there is really no point in using new ArrayList<NameValuePair>(2) just use the default constructor.
Try this:
HttpClient client = new DefaultHttpClient();
client.getParams().setBooleanParameter("http.protocol.expect-continue", false);
This solved my problem.