java.io.IOException: HTTP response code: 400 for URL

Question

Here is my sample code :

String code = request.getParameter("authcode1");
String clientSecret = "xxxxxxxxxxxxx";
String newUrl = "https://accounts.google.com/o/oauth2/token";
String clientId = "xxxxxxxxxxxxxxx";
String callback = "http://localhost:8080/web/guest/home";

String tokenUrl = new String("https://accounts.google.com/o/oauth2/token");

        StringBuffer params = new StringBuffer("");
        params.append("code=" + URLEncoder.encode(code));
        params.append("&client_id=" + clientId);
        params.append("&client_secret=" + clientSecret);
        params.append("&redirect_uri=" + callback);
        params.append("&grant_type=authorization_code");

        try
        {
            // Send data
            URL url = new URL(tokenUrl.toString());
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("POST");
            conn.setDoOutput(true);
            conn.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
            conn.setRequestProperty("Content-Length", "0");
                conn.connect();

            InputStream is;
            if (conn.getResponseCode() != 200) {
                is = conn.getInputStream();
            } else {
                is = conn.getErrorStream();
            }

            //URLConnection conn = url.openConnection();
            //conn.setDoOutput(true);
            OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
            wr.write(params.toString());
            wr.flush();

            // Get the response
            BufferedReader rd = new BufferedReader(new InputStreamReader(is));
            String line;
            while ((line = rd.readLine()) != null)
            {
                System.out.println("-----" + line);
            }
            wr.close();
            rd.close();
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }

I am getting following exception in Tomcat:

java.io.IOException: Server returned HTTP response code: 400 for URL: https://accounts.google.com/o/oauth2/token
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
        at sun.net.www.protocol.http.HttpURLConnection$6.run(HttpURLConnection.java:1368)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.net.www.protocol.http.HttpURLConnection.getChainedException(HttpURLConnection.java:1362)

Please help me what am I doing wrong here? why I am getting java.io.IOException: HTTP response code: 400 for URL exception?

Have you checked what 400 means ? did you try it through the browser. Check this :?checkupdown.com/status/E400.html — giorashc
– giorashc, Commented Jun 11, 2012 at 7:38
When conn.getResponseCode() != 200 you will process the input stream ? That should'nt be reverse ? — PeterMmm
– PeterMmm, Commented Jun 11, 2012 at 7:39

Buhake Sindi · Accepted Answer · 2012-06-11 09:49:08Z

3

First of all, this is incorrect:

if (conn.getResponseCode() != 200) {
                is = conn.getInputStream();
            } else {
                is = conn.getErrorStream();
            }

It should be

if (conn.getResponseCode() == 200) {
                is = conn.getInputStream();
            } else {
                is = conn.getErrorStream();
            }

Your issue is on this line:

conn.setRequestProperty("Content-Length", "0");

You can't send a Content-Length of 0 when you have entity body appended in HTTP message.

Rather, set it as

conn.setRequestProperty("Content-Length", params.toString().length());

edited Jun 11, 2012 at 9:49

answered Jun 11, 2012 at 7:46

Buhake Sindi

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5 Comments

user1443749 Over a year ago

Thanks for all comments. I did change content-length to params.toString.length() and conn.getResponseCode() == 200 but now I am getting java.net.ProtocolException: Cannot write output after reading input. at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:900) at sun.net.www.protocol.https.HttpsURLConnectionImpl.getOutputStream(HttpsURLConnectionImpl.java:230) I get exception at line : OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream()); whats wrong here?

Buhake Sindi Over a year ago

It simple. You first write to OutputStream before reading from InputStream. You are doing the inverse.

user1443749 Over a year ago

@The Elite Gentleman.Thanks. Now I got access_token from server successfully.

Buhake Sindi Over a year ago

Then accept the answer (tick mark below the score) to approve the answer really helped you.

user207421 Over a year ago

@user1443749 You don't need to set the Content-Length at all. Java will do it for you. Correctly. Anything you set yourself is likely to be wrong. Especially zero.

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