Develop Reference

retrofit onFailure() keeps triggering on connecting to localhost

I want to connect to my localhost server for testing my app. For this reason, I am using the retrofit library. This is my interface class, which defines the url to connect to:
import retrofit2.Call;
import retrofit2.http.Field;
import retrofit2.http.FormUrlEncoded;
import retrofit2.http.POST;
public interface PostInterface {
String JSONURL = "http://80.0.0.13/";
#FormUrlEncoded
#POST("login_screen/backend.php")
Call<String> getUserLogin(
#Field("input") String input,
#Field("username") String uname,
#Field("password") String password
);
}
I am calling this interface in my java code:
Call<String> call = null;
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(PostInterface.JSONURL)
.addConverterFactory(ScalarsConverterFactory.create())
.build();
PostInterface api = retrofit.create(PostInterface.class);
call = api.getUserLogin("sign in", "abc", "abc#xyz");
if (call != null) {
call.enqueue(new Callback<String>() {
#Override
public void onResponse(Call<String> call, Response<String> response) {
if (response.body() != null) {
Log.d("success",response.body());
}
}
#Override
public void onFailure(Call<String> call, Throwable t) {
Snackbar snackbar = Snackbar.make(findViewById(android.R.id.content), t.toString(), Snackbar.LENGTH_SHORT);
snackbar.show();
}
});
}
Strangely, the onFailure() method keeps triggering everytime with the following throwable:
javaSocketTimeoutException: Failed to connect to /80.0.0.13 (port 80)....
But when I try the url in my android browser or pc browser, it works fine.
Things I have checked:
The project is stored inside C:\xampp\htdocs, having the exact same hierarchy as in my live server location.
Both Apache and SQL ports are open in my xampp control panel.
My localhost port number is default 80
When I run the app in my emulator using this ip http://10.0.2.2:80/, then it works fine
Why is the app failing to connect to my local server?
EDIT: I can access my site from my phone browser using my pc ip address, but when I want to access it from the app, then the onFailure() triggers

After much struggling, I finally found the solution from a post in github:
Turn on USB Tethering & USB Debugging Mode in your mobile.
Connect your mobile to your laptop/desktop through USB.
Now just change the ip address (run "ipconfig" in cmd)

This is because localhost is not a valid URL for android.
The localhost is a loopback address, which means that the network request will be handled by current device by some application (PHP server).
So, when you enter localhost on your machine (PC/laptop), it will check for server application listening at specified port (in your case 80) and will forward that request to the server application. In your case it is XAMPP which is listening at port 80.
But, when you goto an Android application, there is no server application running on android device or emulator since they are different device. Hence you get 404 error for localhost on Android.
To fix this, simply get the IP address of your PC (using ipconfig command) and use that instead of localhost.
E.g.: In cas the IP address is 192.168.0.129, then your URL would be http://192.168.0.129:80/

cloudrail java desktop app

I'm trying to use cloudrail SDK in my java desktop app for testing ,
but I have problem with runing the sample code in cloudrailsite;
the following codes are main class:
public class DropboxWithCloudRail {
private static String REDIRECT_URL = "http://localhost:3000/";
InputStream inputStream = null;
public void loadDropbox() throws FileNotFoundException, ParseException {
CloudRail.setAppKey("*************");
Dropbox service = new Dropbox(new LocalReceiver(8082),
"*************",
"*************",
REDIRECT_URL,
"Dropbox"
);
service.createFolder(
"/myFolder1"
);
}
}
I set the Redirect URIs in dropbox console http://localhost:3000/
but when I run the project , I get this page:
This site can’t be reached
localhost refused to connect.
Did you mean http://localhost3000.org/?
Search Google for localhost 3000
ERR_CONNECTION_REFUSED

The issue seems to be that you configure your LocalRedirect receiver with the port 8082 which makes it wait for incoming redirects on http://localhost:8082. So this is the URL you have to use as a redirect uri for Dropbox and not http://localhost:3000.

IP address for connecting server on the same LAN using SignalR

I'm trying to create a SignalR connection between an ASP.NET server (SignalR-Server 3.0.0) and an Android client on a real device. So far I've managed to successfully establish a connection on the same computer using a console application client targeting the IP http://127.0.0.1:5000/.
The server computer and the Android device are both connected to the same LAN (over Wi-Fi), so I tried to set the target IP to be the server computer LAN IP, but an exception is thrown:
java.net.SocketTimeoutException: failed to connect to /192.168.14.167
(port 5000) after 15000ms
Here's the relevant client app, using SignalR Java client:
Platform.loadPlatformComponent(new AndroidPlatformComponent());
String serverUrl = "http://192.168.14.167:5000/signalr";
mHubConnection = new HubConnection(serverUrl);
mHubProxy = mHubConnection.createHubProxy("Hub");
ClientTransport clientTransport = new ServerSentEventsTransport(mHubConnection.getLogger());
SignalRFuture<Void> signalRFuture = mHubConnection.start(clientTransport);
try {
signalRFuture.get();
} catch (InterruptedException | ExecutionException e) {
e.printStackTrace();
return;
}
Am I missing anything/doing anything wrong? Any help will be appreciated.

How to get client's Proxy IP address in CometD?

Using fiddler as a HTTP proxy, i connect to a local CometD server.
I inherit the class DefaultSecurityPolicy, and got the client's IP address with server.getContext().getRemoteAddress().getAddress().getHostAddress() in canHandshake Method.
However, it returns the client's real IP (original IP), but what i want is the one directly communicates with the server. Any help?
If the client using WebSocket to communicate with CometD server, The HTTP proxy doesn't take effect at all, So what i got is the original addr, am i right?

public function getlocationFromIp()
{
if (!empty($_SERVER['HTTP_CLIENT_IP'])) {
// Check if using Shared Internet Environment
$ipAddress = $_SERVER['HTTP_CLIENT_IP'];
}elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])){
// Check if using Proxy User
$ipAddress = $_SERVER['HTTP_X_FORWARDED_FOR'];
}else{
$ipAddress = $_SERVER['REMOTE_ADDR'];
}
$ip_geo_url = 'http://freegeoip.net/json/'.$ipAddress;
$ip_json = file_get_contents($ip_geo_url);
$ip_json = json_decode($ip_json);
return $ip_json;
}
it will get the location whit ip if it help you ...
it will be get the proxy location too

Android connection to localhost

I'm trying to connect my android application to a local host url thanks to wamp server but it doesn't work. My goal here, is to fetch json data and parse these data. For my test, i'm using a device not the emulator and i use permission in AndroidManifest.xml :
<uses-permission android:name="android.permission.INTERNET" />
My url looks like this :
String url = "http://10.0.2.2:8080/tests/PhpProject1/connectionBDD.php";
i tried :
http://localhost/
http://10.0.2.2:8080/
http://10.0.2.2/
But it never worked so far :
java.net.ConnectException: failed to connect to localhost/127.0.0.1 (port 80): connect failed: ECONNREFUSED (Connection refused)
failed to connect to /10.0.2.2 (port 8080): connect failed: ETIMEDOUT (Connection timed out)
java.net.ConnectException: failed to connect to /10.0.2.2 (port 80): connect failed: ETIMEDOUT (Connection timed out)
Then i tried with a json url test found on the internet : http://headers.jsontest.com/
It worked really good and i got json data at this address. So i guess my code is good and the issue here is my localhost url, i don't know what should be its exact form..
I read many threads about it but i didn't find a solution.
Here my code :
Main activity :
public class MainActivity extends Activity {
private String url = "http://10.0.2.2:8080/tests/PhpProject1/connectionBDD.php";
private ListView lv = null;
private Button bGetData;
#Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final JsonDownloaderTask task = new JsonDownloaderTask(this);
lv = (ListView) findViewById(R.id.list);
bGetData = (Button)findViewById(R.id.getdata);
bGetData.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
task.execute(url);
}
});
}
public void jsonTaskComplete(JSONArray data){
//todo
}
}
AsyncTask :
public class JsonDownloaderTask extends AsyncTask<String, String, JSONArray> {
MainActivity ma;
public JsonDownloaderTask(MainActivity main){
ma = main;
}
#Override
protected JSONArray doInBackground(String... url) {
JSONParser jParser = new JSONParser();
// Getting JSON from URL
JSONArray jsonArray = null;
try {
jsonArray = jParser.getJSONFromUrl(url[0]);
} catch (IOException e) {
e.printStackTrace();
}
return jsonArray;
}
protected void onPostExecute(JSONArray data){
ma.jsonTaskComplete(data);
}
}
JSONParser :
public class JSONParser {
String data = "";
JSONArray jsonArray = null;
InputStream is = null;
public JSONParser(){}
// Method to download json data from url
public JSONArray getJSONFromUrl(String strUrl) throws IOException{
try{
URL url = new URL(strUrl);
// Creating an http connection to communicate with url
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
// Connecting to url
urlConnection.connect();
// Reading data from url
is = urlConnection.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(is));
StringBuffer sb = new StringBuffer();
String line = "";
while( ( line = br.readLine()) != null){
sb.append(line);
}
is.close();
data = sb.toString();
//br.close();
jsonArray = new JSONArray(data);
}catch(Exception e){
Log.d("Exception while downloading url", e.toString());
}finally{
is.close();
}
return jsonArray;
}
}

IP-address 10.0.2.2 is used to fetch data from the emulator.
Localhost will always point to the emulator/android device running the application.
To let your device fetch data from your pc, it should be in the same network (connected by WiFi to your router) and you should use the local IP-address of your pc (normally a 192.168.1.x-number).

If you try to connect to "localhost", it will resolve to the Android device, not to your own localhost (unless you are running within the emulator). What I recommend for development is to add an overflow menu in the action bar that has an entry named "Settings" that provides a Settings activity for specifying application settings, and to have a "Developer options" entry in "Settings" that lets you specify a custom server address to use. During development, you can use this option to enter a custom server address for your app. (You will need a real server address that is actually reachable over the Internet rather than using localhost for this).

First you have to bind the IP address of the machine where your server is running in the eclipse settings.
You can do this like this.
Right click on the PHP project in the eclipse then Run Configuration then In the Web Application where you will find the Argument tab. Now here give the port and LAN IP address of your machine on which your server is running.
Something like this --port=8888 --address=192.168.1.6 then update the URL to http://192.168.1.6:8080/tests/PhpProject1/connectionBDD.php
Here in my case this is my LAN IP address 192.168.1.6, there you will have to find it using the network command like ipconfig , ifconfig and use that IP address.

if you are using your phone instead of emulator and running services on localhost then in url instead of '10.0.2.2' use IP address of your PC.

I solved it by:
1. Adding another android permission in the manifest: "android.permission.ACCESS_NETWORK_STATE"
2. As I'm using xampp, I've shared the xampp folder of the desktop in the network.
3. The xampp is running in a desktop whose ip is 192.168.x.x so the webservice's url instead of beign "http://localhost/myapi..." is "http://192.168.x.x/myapi..."
I tested the app using the emulator and also in a device. Both cases works out.

One simple way i know is keep mobile data on and share wifi . Connect your laptop or computer to this wifi . Now see ip of ur laptop or desktop. Call service from ur phone . Since your phone and your computer are in same network now.

I assume you are trying to access web service available on your PC from either an android simulator or a real device.
For an android emulator, you must NOT just use "localhost", because "localhost" means android emulator itself, NOT the host PC.
you need modify the /etc/hosts file or the simulator or real device. add a line like "192.168.0.100 service.local".

I tried "10.0.2.2:80/mysitename/page.php"
Miracle happened, it's working now.
I am on Mac and using XAMPP for server.
You can change port no. to 80 and try.
port 8080 was not working for me!
Cheers.

Just Install the "conveyor by Keyoti" the extension in Visual studio and it will generate a url according to your ip address automatically. here's the link:
conveyor
so far so good....!