Using HttpURLConnection on Android

Question

I am trying to connect a web server I have running in my android App however for some reason it's failing.

I can connect to the webpage normally and using my phone's browser, I can also use the below code to connect to google but for some reason my code will not connect to my web server. If I host the server on port 80 I get error code 503 every time, if I host it on 8080 (which is preferable) I get a timeout exception which is below.

03-05 20:12:22.432: WARN/System.err(29254): java.net.SocketException: The operation timed out
03-05 20:12:22.602: WARN/System.err(29254):     at org.apache.harmony.luni.platform.OSNetworkSystem.connectSocketImpl(Native Method)
03-05 20:12:22.602: WARN/System.err(29254):     at org.apache.harmony.luni.platform.OSNetworkSystem.connect(OSNetworkSystem.java:125)
03-05 20:12:22.602: WARN/System.err(29254):     at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:227)
03-05 20:12:22.612: WARN/System.err(29254):     at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:521)
03-05 20:12:22.612: WARN/System.err(29254):     at java.net.Socket.connect(Socket.java:1019)
03-05 20:12:22.612: WARN/System.err(29254):     at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection.<init>(HttpConnection.java:67)
03-05 20:12:22.612: WARN/System.err(29254):     at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnectionManager$ConnectionPool.getHttpConnection(HttpConnectionManager.java:151)
03-05 20:12:22.612: WARN/System.err(29254):     at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnectionManager.getConnection(HttpConnectionManager.java:73)
03-05 20:12:22.612: WARN/System.err(29254):     at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnection.getHTTPConnection(HttpURLConnection.java:826)
03-05 20:12:22.612: WARN/System.err(29254):     at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:812)
03-05 20:12:22.612: WARN/System.err(29254):     at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnection.getResponseCode(HttpURLConnection.java:1275)
03-05 20:12:22.612: WARN/System.err(29254):     at com.project.library.remailer.ServerSelect.downloadDirectory(ServerSelect.java:84)
03-05 20:12:22.622: WARN/System.err(29254):     at com.project.main.NewMessage$3$1$1.run(NewMessage.java:156)

The code is:

try {
    URL url = new URL(directoryLocation);
    HttpURLConnection httpURLConnection = (HttpURLConnection) url
            .openConnection();

    // The line below is where the exception is called
    int response = httpURLConnection.getResponseCode();                 
    if (response == HttpURLConnection.HTTP_OK) {


        // Response successful
    InputStream inputStream = httpURLConnection.getInputStream();

    // Parse it line by line
    BufferedReader bufferedReader = new BufferedReader(
                new InputStreamReader(inputStream));
    String temp;
    while ((temp = bufferedReader.readLine()) != null) {
        // Parsing of data here
    }
       } else {
            Log.e("SAMES", "INCORRECT RETURN CODE: " + response);
       }
} catch (MalformedURLException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
} catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}

When I try the code in the link suggested by CommonsWare for port 8080 I get the same error as before, the timeout exception. For port 80 I get the following exception, both of these errors occur on the url.openStream().

Port 80 exception:

03-06 11:53:53.296: WARN/System.err(639): java.io.FileNotFoundException: http://64.197.194.165:80/path
03-06 11:53:53.376: WARN/System.err(639):     at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1064)
03-06 11:53:53.376: WARN/System.err(639):     at java.net.URL.openStream(URL.java:674)
03-06 11:53:53.376: WARN/System.err(639):     at com.project.library.remailer.ServerSelect.downloadDirectory(ServerSelect.java:118)
03-06 11:53:53.376: WARN/System.err(639):     at com.project.main.NewMessage$3$1$1.run(NewMessage.java:156)

I also tried using the following code:

HttpClient client = new DefaultHttpClient();
        HttpGet request = new HttpGet(directoryLocation);
        try
        {
            HttpResponse response = client.execute(request);
            BufferedReader reader = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
            String line;
            while((line = reader.readLine()) != null) {
                Log.e("SAMES", line);
        }

    }
    catch(Exception e)
    {
        e.printStackTrace();
    }

However that has resulted in the same timeout error for port 8080, which occurs when client.execute(response) is called.

For port 80 I get a webpage which says that it couldn't connect, which alot of HTML editing, however the main thing it says on the page is:

03-06 13:10:23.576: ERROR/SAMES(1267): The Web Server may be down, too busy, or experiencing other problems preventing it from responding to requests. You may wish to try again at a later time.

Answer 1

What happens if you try calling httpURLConnection.connect() after calling url.openConnection()?

Answer 2

Various notes:

• You don't indicate where the timeout occurred.
• You might try this example, which uses URL differently than you are.
• Your error code 503 on port 80 should result in some error information on your server that might be useful.
• Are there any proxy servers or other things between your phone and the Web server?
• Have you tried with both WiFi and 3G?
• You might try switching to HttpClient and see if you get better results or perhaps a better error message.