php - IFrame Comet response contains no data -

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i'm experimenting comet , i'm stuck implementing via hidden iframe ("forever frame".

this index.html:

<!doctype html> <html>   <head>     <script type="text/javascript">     cometresponse = function() {         var debugout = document.getelementbyid('debugoutput');         return function(response) {             debugout.innerhtml = response.number;          }     }     </script>   </head>   <body>     <div id="debugoutput"></div>     <iframe src="comet.php"></iframe>   </body> </html>

and comet.php file:

<?php set_time_limit(0); header('content-type: text/html'); header('cache-control: no-cache, must-revalidate');  header('expires: mon, 26 jul 1997 05:00:00 gmt'); header('transfer-encoding: chunked'); flush(); ob_flush();  $response = '<script type="text/javascript"> parent.cometresponse({     number: %1$d }); </script>';  ($i = 0; $i < 2; $i++) {     sleep(1);     $data = sprintf($response, $i);     $output = strtoupper(dechex(strlen($data)))."\r\n".$data."\r\n";     echo $output;     flush();     ob_flush(); } echo "0\r\n\r\n";

after loading page, browser seems "wait" response. after few seconds, firebug shows empty response these response headers:

http/1.1 200 ok date: mon, 26 jul 2010 09:34:04 gmt server: apache/2.2.14 (win32) php/5.2.12 x-powered-by: php/5.2.12 cache-control: no-cache, must-revalidate expires: mon, 26 jul 1997 05:00:00 gmt transfer-encoding: chunked vary: accept-encoding content-encoding: gzip keep-alive: timeout=5, max=99 connection: keep-alive content-type: text/html;charset=iso-8859-2

since response treated empty, tag should in response doesn't executed either.

however, if remove "transfer-encoding: chunked" header, content sent browser correctly in 1 big piece @ end of script, expected.

i can't find what's going wrong here.

two guesses:

  1. content-encoding: gzip

    maybe mod_gzip not work correctly? have tried on annother host?

  2. maybe firefox ignores code, if not within < html>

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