CODEWITHSUNDEEP
javaphpandroidhttpurlconnectionprotocolexception
Cliff Burton
Cliff Burton

Reputation: 3744

java.net.ProtocolException: Unexpected status line: <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">

I am new to Java and Android programming, I'm trying to get the result of a PHP file on my server but I get the following exception:

java.net.ProtocolException: Unexpected status line: <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
07-10 11:18:54.112 24683-25081/it.codesnippet.dots W/System.err:     at com.android.okhttp.internal.http.StatusLine.parse(StatusLine.java:54)
07-10 11:18:54.112 24683-25081/it.codesnippet.dots W/System.err:     at com.android.okhttp.internal.http.HttpConnection.readResponse(HttpConnection.java:191)
07-10 11:18:54.112 24683-25081/it.codesnippet.dots W/System.err:     at com.android.okhttp.internal.http.HttpTransport.readResponseHeaders(HttpTransport.java:80)
07-10 11:18:54.112 24683-25081/it.codesnippet.dots W/System.err:     at com.android.okhttp.internal.http.HttpEngine.readNetworkResponse(HttpEngine.java:905)
07-10 11:18:54.112 24683-25081/it.codesnippet.dots W/System.err:     at com.android.okhttp.internal.http.HttpEngine.readResponse(HttpEngine.java:789)
07-10 11:18:54.112 24683-25081/it.codesnippet.dots W/System.err:     at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:443)
07-10 11:18:54.112 24683-25081/it.codesnippet.dots W/System.err:     at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:388)
07-10 11:18:54.112 24683-25081/it.codesnippet.dots W/System.err:     at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:231)
07-10 11:18:54.112 24683-25081/it.codesnippet.dots W/System.err:     at it.codesnippet.dots.LoginActivity$1$override.run(LoginActivity.java:49)
07-10 11:18:54.112 24683-25081/it.codesnippet.dots W/System.err:     at it.codesnippet.dots.LoginActivity$1$override.access$dispatch(LoginActivity.java)
07-10 11:18:54.112 24683-25081/it.codesnippet.dots W/System.err:     at it.codesnippet.dots.LoginActivity$1.run(LoginActivity.java:0)
07-10 11:18:54.112 24683-25081/it.codesnippet.dots W/System.err:     at java.lang.Thread.run(Thread.java:818)

This is the code (in LoginActivity.java) where the exception comes from:

Thread loginCheckThread = new Thread(new Runnable() {
    public void run() {
        String result = "", dataObj = "";
        TextView username = (TextView) findViewById(R.id.login_mail);
        TextView password = (TextView) findViewById(R.id.login_password);

        JSONObject jsonObj = new JSONObject();
        try {
            jsonObj.put("loginMail", username.getText());
            jsonObj.put("loginPassword", password.getText());
            dataObj = jsonObj.toString(0);
        } catch (JSONException e) {
            e.printStackTrace();
        }

        try {
            URL url = new URL("http://myserver.it/testandroid.php?data=" + dataObj);
            HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();

            try {
/* line #49 */  InputStream in = new BufferedInputStream(urlConnection.getInputStream());
                ByteArrayOutputStream bo = new ByteArrayOutputStream();
                int i = in.read();
                while (i != -1) {
                    bo.write(i);
                    i = in.read();
                }
                result = bo.toString();
            } catch (IOException e) {
                result = "Exception: Class::IOStream Related";
                e.printStackTrace();

            } finally {
                urlConnection.disconnect();
            }
        } catch (IOException e) {
            result = "Exception: Class::URL Related";
        }

        System.out.println(result);
    }
});
loginCheckThread.start();

The line which causes the exception is line #49:

InputStream in = new BufferedInputStream(urlConnection.getInputStream());

The PHP file is just a test file for now and is supposed to return <input_username> - <input_password> retrieved from the data variable in the query string:

$jsonObj = json_decode($_GET["data"], TRUE);

echo $jsonObj["loginMail"] . " - " . $jsonObj["loginPassword"];

Is about two days that this problem blocked me, what can I do to solve this?

Upvotes: 0

Views: 3414

Answers (2)

marcode_ely
marcode_ely

Reputation: 436

Important

To anyone who has this error in you Volley HTTP implementation:

java.net.ProtocolException: Unexpected status line: <!DOCTYPE HTML PUBLIC “-//IETF//DTD HTML 2.0//EN”>

Please check and use OkHttp Dependency for solve it. Here the documentation to check.

In my case (I don't know why), my Android Test Phone (MOTO E V.4.4.4 Kitkat) was getting me back the java.net.ProtocolException: Unexpected status line exception. I tried to reset the phone and deleting the app, and nothing works.

For the other side, my Nexus 5X (With Android Oreo) was working good (same app, same network, same backend).

Please (really) try the OkHttp dependency and it gonna work.

Psd: Some stackoverflow threads says about Volley Cache or something like that, tried everything in my own, but OkHttp solved my trouble.

Upvotes: 1

DanielB
DanielB

Reputation: 369

I'm not yet allowed to leave a comment, therefore I need to write an answer. There is a difference between HTTP and HTML. HTTP is used to download data (such as HTML). Your PHP script generates the downloadable content, but the HTTP client doesn't seem to think that it is the content already. As an example I'd like to show you how a HTTP response usually looks like:

HTTP/1.1 200 OK
Date: Sun, 10 Jul 2016 10:02:42 GMT
Content-Type: text/html
Content-Length: 6920
Last-Modified: Sun, 10 Jul 2016 04:00:22 GMT
Connection: keep-alive
Accept-Ranges: bytes

Here goes the content.

As you can see the HTTP information appears until a double newline or CRLF (carriage return, line feed) appears. I've seen some server implementing that with LF only and that might be the problem, since your Java client isn't able to see when the content starts. Lets make a test: add an echo "\r\n\r\n"; right at the start of your PHP file to print the CRLFCRLF manually. If it then works, it is your server software's output which is wrong. Not your script and not your client. However, the RFC 2616 also says that it is recommended to ignore the CR and only watch for an LF:

The line terminator for message-header fields is the sequence CRLF. However, we recommend that applications, when parsing such headers, recognize a single LF as a line terminator and ignore the leading CR. RFC 2616

Upvotes: 0

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