Zip data posted from client does not show up correctely at Server

Question

The java client post GZip'd data to the Webserver. The webserver for some reason shows the first 10 bytes correctly. Not sure what I am overlooking
Also get java.io.EOFException: Unexpected end of ZLIB input stream
public class GetPost {
     public String line;
     public String inputLine;
public static void main(String[] args) throws Exception {
          GetPost r = new GetPost();
               r.postURL("User","pass");
// public Reverse { }
public static byte [] zip(String data)
throws IOException
byte[] incomingBytes = data.getBytes();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
GZIPOutputStream zip = new GZIPOutputStream(baos);
for (int i = 0; i < incomingBytes.length; i++)
zip.write(incomingBytes[i] & 0xFF);
zip.close();
byte[] uncompressedBytes = baos.toByteArray();
return uncompressedBytes;
public static String unzip(byte [] dataBytes)
throws IOException
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ByteArrayInputStream bios = new ByteArrayInputStream(dataBytes);
GZIPInputStream unzip = new GZIPInputStream(bios);
int in = unzip.read();
while (in != -1)
baos.write(in);
in = unzip.read();
unzip.close();
return new String(baos.toByteArray());
public String postURL( String t1 , String t2 ){
try {
          String data1="h";
URL urlpost = new URL("http://192.168.15.4:8080/result.html");
     URLConnection conn = urlpost.openConnection();
     conn.setDoOutput(true);
     GZIPOutputStream gz = new GZIPOutputStream(conn.getOutputStream());
     byte [] kkkk=zip(data1);
     String uuu=unzip(kkkk);
     System.out.println("XXXXX" + uuu );
     for (int i=0; i< kkkk.length ; i++){
          Byte jj= new Byte(kkkk);
          System.out.println("LLLL " + " " + i + " " + jj );
     int t= kkkk.length;
     System.out.println("IIII" + t);
     int x= data1.getBytes().length;
     gz.write(kkkk);
     gz.finish();
     gz.close();
     // Get the response
     BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
     while ((line = rd.readLine()) != null) {
     // Process line...
     System.out.println ("The line is " + line );
     } catch (Exception e) {
          return line;
The client output is
LLLL 0 31
LLLL 1 -117
LLLL 2 8
LLLL 3 0
LLLL 4 0
LLLL 5 0
LLLL 6 0
LLLL 7 0
LLLL 8 0
LLLL 9 0
LLLL 10 -53
LLLL 11 0
LLLL 12 0
LLLL 13 -25
LLLL 14 6
LLLL 15 107
LLLL 16 -111
LLLL 17 1
LLLL 18 0
LLLL 19 0
LLLL 20 0
Server output is correct only for the first 10 bytes
LLLL 0 31
LLLL 1 -117
LLLL 2 8
LLLL 3 0
LLLL 4 0
LLLL 5 0
LLLL 6 0
LLLL 7 0
LLLL 8 0
LLLL 9 0
LLLL 10 -53
LLLL 11 0
LLLL 12 0
LLLL 13 -25
LLLL 14 6
LLLL 15 107
LLLL 16 -111
LLLL 17 1
LLLL 18 0
LLLL 19 0
LLLL 20 0

Answer 1

FYI - I got it to work ... I was gzip it twice... here is what worked
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.util.zip.*;
import java.io.OutputStreamWriter;
public class WorkingCopyOfGetPost {
     public String line;
     public String inputLine;
public static void main(String[] args) throws Exception {
          WorkingCopyOfGetPost r = new WorkingCopyOfGetPost();
               r.postURL("User","pass");
// public Reverse { }
public static byte [] zip(String data) throws IOException {
     byte[] incomingBytes = data.getBytes();
     ByteArrayOutputStream baos = new ByteArrayOutputStream();
     GZIPOutputStream zip = new GZIPOutputStream(baos);
     for (int i = 0; i < incomingBytes.length; i++){
          zip.write(incomingBytes[i] & 0xFF);
     zip.close();
     byte[] uncompressedBytes = baos.toByteArray();
     return uncompressedBytes;
public static String unzip(byte [] dataBytes) throws IOException {
     ByteArrayOutputStream baos = new ByteArrayOutputStream();
     ByteArrayInputStream bios = new ByteArrayInputStream(dataBytes);
     GZIPInputStream unzip = new GZIPInputStream(bios);
     int in = unzip.read();
     while (in != -1){
          baos.write(in);
          in = unzip.read();
     unzip.close();
     return new String(baos.toByteArray());
public static ByteArrayOutputStream zip1(String data) throws IOException {
          byte[] incomingBytes = data.getBytes();
          ByteArrayOutputStream baos = new ByteArrayOutputStream();
          GZIPOutputStream zip = new GZIPOutputStream(baos);
          for (int i = 0; i < incomingBytes.length; i++){
               zip.write(incomingBytes[i] & 0xFF);
          zip.close();
          //byte[] uncompressedBytes = baos.toByteArray();
          return baos;
public String postURL( String t1 , String t2 ){
     String data1="t";
     try {
          /* byte [] kkkk=zip(data1);
          for (int x=0;x<20;x++){
               System.out.println("Byte Array Values " + x + kkkk[x] );
          ByteArrayOutputStream bo= zip1(data1);
          byte [] AAA=bo.toByteArray();
          for (int x=0;x<21;x++){
               System.out.println("Byte Array Values " + x + " "+ AAA[x] );
          URL urlpost = new URL("http://192.168.15.4:8080/result.html");
     URLConnection conn = urlpost.openConnection();
     conn.setDoOutput(true);
     System.out.println( "The size of the byteArrayOutputstream " + bo.size() );
     bo.writeTo(conn.getOutputStream());
     // GZIPOutputStream gz = new GZIPOutputStream(conn.getOutputStream());
     // System.out.println("rrrr " + kkkk.length);
     // gz.write(kkkk);
     //gz.finish();
     //gz.flush();
     bo.flush();
     // String s=unzip(kkkk) ;
     //System.out.println("s " + s);
     // Get the response
     BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
     while ((line = rd.readLine()) != null) {
     // Process line...
     System.out.println ("The line is " + line );
     rd.close();
     bo.close();
     } catch (Exception e) {
          return line;
}