Identical request in browser and Java with different responses, why does this happen?

[John Kay]

I am writing a java program that is sending a HTTP 1.1 request and getting a response from a web server. The request that I am sending is identical to the one in the browser, IE8. I am using ieHTTPheaders to see what the headers are for the request. I am mimicking this request exactly in java(except for the cookie and the time stamp which is the number after "turnCacheOff="), but in my response headers I get in java specifically the header Transfer-Encoding: chunked is different than the header Content-Length: 1327 that I get in the browser. Why does this happen when the requests are exactly the same? Here is the browser request headers:

GET /WFLogon?inv=cl457239&turnCacheOff=1285437824858 HTTP/1.1
Accept: image/gif, image/jpeg, image/pjpeg, application/x-ms-application, application/vnd.ms-xpsdocument, application/xaml+xml, application/x-ms-xbap, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*
Referer: http://service.atty-pierce.com/
Accept-Language: en-us
User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; GTB6; Comcast Install 1.0; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.0.30729; .NET4.0C; .NET4.0E; InfoPath.2; .NET CLR 3.5.30729)
Accept-Encoding: gzip, deflate
Host: service.atty-pierce.com
Proxy-Connection: Keep-Alive

Browser Response Headers:

HTTP/1.1 200 OK
Server: WebSphere Application Server/5.0
Set-Cookie: JSESSIONID=0000aZd4utW600Wzgi11Rg8qywu:-1;Path=/
Cache-Control: no-cache="set-cookie,set-cookie2"
Expires: Thu, 01 Dec 1994 16:00:00 GMT
Content-Type: text/html; charset=UTF-8
Content-Language: en-US
Content-Length: 1327

In my java program the request headers are identical the that of the browser but the response comes back as:

HTTP/1.1 200 OK
Server: WebSphere Application Server/5.0
Set-Cookie: JSESSIONID=0000__qTreRMAs-768fpanccifr:-1;Path=/
Cache-Control: no-cache="set-cookie,set-cookie2"
Expires: Thu, 01 Dec 1994 16:00:00 GMT
Content-Type: text/html; charset=UTF-8
Content-Language: en-US
Transfer-Encoding: chunked

Here is the code that I am using to make the request:

Calendar calendar = Calendar.getInstance();
        java.util.Date now = calendar.getTime();
        java.sql.Timestamp currentTimestamp = new java.sql.Timestamp(now.getTime());
        System.out.println(currentTimestamp.getTime());
 
 
InputStream is2=null;
OutputStream os2=null;
String request="";
        try {
            Socket pierce2 = new Socket("service.atty-pierce.com", 80);
            os2=pierce2.getOutputStream();
            is2=pierce2.getInputStream();
            request+="GET /WFLogon?inv=cl457239&turnCacheOff=" + Long.toString(currentTimestamp.getTime()) + " HTTP/1.1\r\n";
            request+="Accept: image/gif, image/jpeg, image/pjpeg, application/x-ms-application, application/vnd.ms-xpsdocument, application/xaml+xml, application/x-ms-xbap, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*\r\n";
            request+="Referer: http://service.atty-pierce.com/\r\n";
            request+="Accept-Language: en-us\r\n";
            request+="User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; GTB6; Comcast Install 1.0; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.0.30729; .NET4.0C; .NET4.0E; InfoPath.2; .NET CLR 3.5.30729)\r\n";
            request+="Accept-Encoding: gzip, deflate\r\n";
            request+="Host: service.atty-pierce.com\r\n";
            request+="Proxy-Connection: Keep-Alive\r\n\r\n";
            System.out.print(request);
            os2.write(request.getBytes());
 
            int c;
            do
            {
                char x;
                c=is2.read();
                x=(char)c;
                if (c!=-1) System.out.print(x);
            } while (c!=-1);
 
        } catch (Exception ex) {
            Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
        }