Android GZIPInputStream not recognizing gzip format

This has really been annoying me and it is quite important for me to find the problem here. The android code below is not unzipping for me.

HttpClient client = new DefaultHttpClient();
        HttpGet get = new HttpGet("http://www**************/get.php");
        get.addHeader("Accept-Encoding", "gzip");
        try {                   
            HttpResponse response = client.execute(get);
            InputStream instream = response.getEntity().getContent();
            Header contentEncoding = response.getFirstHeader("Content-Encoding");
            //Log msg header
            Header[] header = response.getAllHeaders();
            for(Header i : header) {
                Log.d("TEST", i.getName() + ":" + i.getValue() );
            }
            if (contentEncoding.getValue().equalsIgnoreCase("gzip")) {
                Log.d("TEST", "Content is gzipped");
                try {
                    instream = new GZIPInputStream(instream);
                    processStream(instream);
                 } finally {
                     instream.close();
                 }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }

Logcat output:

D/TEST    ( 1067): Date:Fri, 03 Jun 2011 05:18:33 GMT
D/TEST    ( 1067): Server:Apache
D/TEST    ( 1067): X-Powered-By:PHP/5.2.10
D/TEST    ( 1067): Content-Encoding:gzip
D/TEST    ( 1067): Content-Length:765
D/TEST    ( 1067): Connection:close
D/TEST    ( 1067): Content-Type:application/json
D/TEST    ( 1067): Content is gzipped

W/System.err( 1067): java.io.IOException: Unknown format
W/System.err( 1067):    at java.util.zip.GZIPInputStream.<init>(GZIPInputStream.java:85)
W/System.err( 1067):    at java.util.zip.GZIPInputStream.<init>(GZIPInputStream.java:66)
W/System.err( 1067):    at com.mannotron.gallery.GalleryExample$GetImages.doInBackground(GalleryExample.java:69)
W/System.err( 1067):    at com.mannotron.gallery.GalleryExample$GetImages.doInBackground(GalleryExample.java:1)
W/System.err( 1067):    at android.os.AsyncTask$2.call(AsyncTask.java:185)
W/System.err( 1067):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
W/System.err( 1067):    at java.util.concurrent.FutureTask.run(FutureTask.java:137)
W/System.err( 1067):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068)
W/System.err( 1067):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561)
W/System.err( 1067):    at java.lang.Thread.run(Thread.java:1096)

edit: added php code

Server side php:

//ob_start('ob_gzhandler');
header("HTTP/1.1 200 OK");
header("Content-Type: application/json"); 
header("Content-Encoding: gzip"); 


$dbhost = "xxxxxx";
$dbname = "xxxxxx";
$user = "xxxxxx";
$pass = "xxxxxx";

//Open databse connection
$db = new mysqli($dbhost,$user,$pass,$dbname) or die('Error opening db');   


$query = "SELECT * FROM Spots; ";
$result = null;
$result = $db->query($query);
$data = array();
while($row = $result->fetch_assoc()) {
    $data [] = $row;
}
$spots = '{"spots":'.json_encode($data)."}";
echo gzencode($spots,FORCE_GZIP);

$db->close();   
//ob_flush();

?>

I have tried both gz_encode() and outputbuffering with gzip at the server end in php. Can anyone s开发者_开发知识库ee what I'm doing wrong? Thanks for your time.

The stream looks wrong, as it should start with '1f8b'. The reason might be a stray 'a' in your php-file. But the posted samples seem to be all right.