How does Keep-Alive change my behaver - or must I set cache to 0?

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I have made a simple HTML5 Builder project (HTML5 Builder XE5). 2 buttons, one to download a PDF and one to change the Label. When I click on the label-changing button it works find. After that I click on the Download PDF Button it works fine also. But now: WHen I do a click on the label changing button after that the PDF FIle is downloaded again. No Label is changed. As I can see in the Fiddler Protocol the transaction is done be resending the same information. My Keep-Alive header is on: the complete request/response headers are:

     POST /bug/unit1.php HTTP/1.1
     Host: localhost
     Connection: keep-alive
     Content-Length: 86
     Cache-Control: max-age=0
     Accept: text/html,application/xhtml+xml,application   
             /xml;q=0.9,image    /webp,*/*;q=0.8
     Origin: http://localhost
     User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 
                 (KHTML, like Gecko) Chrome/41.0.2272.76 Safari/537.36
     Content-Type: application/x-www-form-urlencoded
     Referer: http://localhost/bug/unit1.php
     Accept-Encoding: gzip, deflate
     Accept-Language: de-DE,de;q=0.8,en-US;q=0.6,en;q=0.4
     Cookie: PHPSESSID=5i7jkm5siua4s1jrs6bthc93d1

the response is:

    HTTP/1.1 200 OK
Date: Thu, 05 Mar 2015 09:29:28 GMT
Server: Apache/2.2.21 (Win32) mod_ssl/2.2.21 OpenSSL/1.0.0e PHP/5.3.8 mod_perl/2.0.4 Perl/v5.10.1
X-Powered-By: PHP/5.3.8
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0,pre-check=0
Pragma: no-cache
Content-Disposition: attachment;filename='downloaded.pdf'
Keep-Alive: timeout=5, max=97
Connection: Keep-Alive
Transfer-Encoding: chunked
Content-Type: application/pdf

For the first PDF Click the response is correct. It sends the PDF for download. When I click the Label changing button at start up the request/response headers are following. An at startup it works fine.

request headers for label changing:

POST http://localhost/bug/unit1.php HTTP/1.1
Host: localhost
Connection: keep-alive
Content-Length: 86
Cache-Control: max-age=0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Origin: http://localhost
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.76 Safari/537.36
Content-Type: application/x-www-form-urlencoded
Referer: http://localhost/bug/unit1.php
Accept-Encoding: gzip, deflate
Accept-Language: de-DE,de;q=0.8,en-US;q=0.6,en;q=0.4
    Cookie: PHPSESSID=5i7jkm5siua4s1jrs6bthc93d1

response headers from label changing

HTTP/1.1 200 OK
Date: Thu, 05 Mar 2015 09:29:24 GMT
Server: Apache/2.2.21 (Win32) mod_ssl/2.2.21 OpenSSL/1.0.0e PHP/5.3.8 mod_perl/2.0.4 Perl/v5.10.1
X-Powered-By: PHP/5.3.8
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Content-Length: 1347
Keep-Alive: timeout=5, max=99
Connection: Keep-Alive
Content-Type: text/html

How can I enforce that the click on Label-Changing butten after clicking the PDF-Download Button will work again?

I did realize the function call for downloading by changing the headers: like so:

   //Class definition
   class Page1 extends Page
   {
   public $Label1 = null;
   public $Button2 = null;
   public $Button1 = null;
   function Button2Click($sender, $params)
   {
   $this->Label1->Caption = " Hello world";
   }
   function Button1Click($sender, $params)
   {
   header("Content-type:application/pdf");

   // It will be called downloaded.pdf
   header("Content-Disposition:attachment;filename='downloaded.pdf'");

   // The PDF source is in original.pdf
   readfile("original.pdf");
   flush ();
   }
   }

asked 33 secs ago

Walter Schrabmair

33

How does Keep-Alive change my behaver - or must I set cache to 0?