I have a small website where some content is displayed within a HTML tag using AJAX. The content is simply taken from another page on the same web site. However, sometimes instead of loading the parsed PHP file, the browser displays a download box instead. I downloaded the file and this is what it looks like a text file mixed with binary or gzipped data. I can't paste the binary stuff here, but here are some of the headers: Jul 2012 18:52:16 GMT Server: Apache/2 X-Powered-By: PHP/5.3.10 Content-Encoding: gzip Vary: Accept-Encoding,User-Agent Keep-Alive: timeout=1, max=95 Connection: Keep-Alive Transfer-Encoding: chunked Content-Type: text/html HTTP/1.1 304 Not Modified Date: Sun, 01 Jul 2012 18:52:16 GMT Server: Apache/2 Connection: Keep-Alive Keep-Alive: timeout=1, max=93 ETag: "2fc857-409-4c39691c59b40" HTTP/1.1 304 Not Modified Date: Sun, 01 Jul 2012 18:52:16 GMT Server: Apache/2 Connection: Keep-Alive Keep-Alive: timeout=1, max=92 ETag: "2fc854-3e5-4c39691b65900" HTTP/1.1 304 Not Modified Date: Sun, 01 Jul 2012 18:52:16 GMT Server: Apache/2 Connection: Keep-Alive Keep-Alive: timeout=1, max=91 ETag: "2fc847-3e3-4c3969197d480" and large blocks of stuff like this: µàl]&BaËÜk#ìÏ