HttpUrlConnection.connect fails

Question

I've been trying to create a small app that connects to url in editText and returns the status code.

Here is the onCreate code:

 override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
    button.setOnClickListener {
        val url = editText.text.toString()
        var connection: HttpURLConnection? = null
        if (URLUtil.isValidUrl(url)) {
            connection = URL(url).openConnection() as HttpURLConnection
            var thr = Thread {
                connection.connect()
                val code = connection.responseCode
                runOnUiThread {
                    if (code != 404 && code != 500) {
                        textView.text = "Ok"
                    } else {
                        textView.text = "Failed"
                    }
                }

            }
            thr.start()
            thr.join()
        } else {
            textView.text = "Failed"
        }
    }

The problem is that whenever URL is valid, runtime error occurs in .connect() method. Internet permission is set up in android manifest. What causes that issue?

E/AndroidRuntime: FATAL EXCEPTION: Thread-2
Process: com.example.company.myapplication, PID: 27183
java.net.SocketException: socket failed: EPERM (Operation not permitted)
    at java.net.Socket.createImpl(Socket.java:492)
    at java.net.Socket.getImpl(Socket.java:552)
    at java.net.Socket.setSoTimeout(Socket.java:1180)
    at com.android.okhttp.internal.io.RealConnection.connectSocket(RealConnection.java:143)
    at com.android.okhttp.internal.io.RealConnection.connect(RealConnection.java:116)
    at com.android.okhttp.internal.http.StreamAllocation.findConnection(StreamAllocation.java:186)
    at com.android.okhttp.internal.http.StreamAllocation.findHealthyConnection(StreamAllocation.java:128)
    at com.android.okhttp.internal.http.StreamAllocation.newStream(StreamAllocation.java:97)
    at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:289)
    at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:232)
    at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:465)
    at com.android.okhttp.internal.huc.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:131)
    at com.android.okhttp.internal.huc.DelegatingHttpsURLConnection.connect(DelegatingHttpsURLConnection.java:90)
    at com.android.okhttp.internal.huc.HttpsURLConnectionImpl.connect(HttpsURLConnectionImpl.java:30)
    at com.example.company.myapplication.MainActivity$onCreate$1$thr$1.run(MainActivity.kt:25)
    at java.lang.Thread.run(Thread.java:919)

Possibly related: https://stackoverflow.com/questions/56266801/java-net-socketexception-socket-failed-eperm-operation-not-permitted — PiRocks, Feb 16 '20 at 15:15
It still crashes even after the solution in this question, but now error message is too ambiguous `2020-02-16 18:24:24.516 28578-28639/com.example.company.myapplication E/AndroidRuntime: FATAL EXCEPTION: Thread-2 Process: com.example.company.myapplication, PID: 28578` — Alexander Kraynov, Feb 16 '20 at 15:28
Are you running on emulator or an actual device? Do other network requiring apps on emulator/device work? — PiRocks, Feb 16 '20 at 15:34
Let us [continue this discussion in chat](https://chat.stackoverflow.com/rooms/207936/discussion-between-pirocks-and-alexander-kraynov). — PiRocks, Feb 16 '20 at 15:36

score 1 · Accepted Answer · answered Feb 16 '20 at 18:24

For those who didn't read chat:

URLUtil.isValidUrl(url) doesn't check that the url in question actually can be resolved to a website/server. This means that when connect is called on a website/server that doesn't exist, an exception is thrown, since there is nothing to connect to.

score 0 · Answer 2 · answered Feb 16 '20 at 17:56

0

Hi please check if you have provided the permission of internet in your manifest,

<manifest >
 <uses-permission android:name="android.permission.INTERNET" />
 <application> 
  ...
 </application> 
</manifest>

answered Feb 16 '20 at 17:56

Chetan Gupta

1,477
1
13
22

HttpUrlConnection.connect fails

2 Answers2