Merge "Stop using invalid URL to prevent unexpected crash" into qt-dev

import android.os.SystemProperties;

import android.provider.Settings;

import android.util.Log;

import android.webkit.URLUtil;

import com.android.internal.annotations.GuardedBy;

import com.android.internal.util.TrafficStatsConstants;

     * @throws IOException if the URL is malformed, or the PAC file is too big.

     */

    private static String get(Uri pacUri) throws IOException {

        URL url = new URL(pacUri.toString());

        URLConnection urlConnection = url.openConnection(java.net.Proxy.NO_PROXY);

        if (!URLUtil.isValidUrl(pacUri.toString()))  {

            throw new IOException("Malformed URL:" + pacUri);

        }

        final URL url = new URL(pacUri.toString());

        URLConnection urlConnection;

        try {

            urlConnection = url.openConnection(java.net.Proxy.NO_PROXY);

            // Catch the possible exceptions and rethrow as IOException to not to crash the system

            // for illegal input.

        } catch (IllegalArgumentException e) {

            throw new IOException("Incorrect proxy type for " + pacUri);

        } catch (UnsupportedOperationException e) {

            throw new IOException("Unsupported URL connection type for " + pacUri);

        }

        long contentLength = -1;

        try {

            contentLength = Long.parseLong(urlConnection.getHeaderField("Content-Length"));