Question

I have a php script which records an impression then displays an image.

// Determine which header to send. 
$parts = explode('.', $tool->filename);
header("Content-Type: image/{$parts[1]}");
readfile('files/'.$tool->filename);

For some reason Firefox is getting the file twice. Here is the log.

00:00:01.268    0.023   1211    182 GET 200 image/png   http://localhost/ap/image.php?aid=1&t=6
00:00:01.347    0.162   1185    182 GET 200 image/png   http://localhost/ap/image.php?aid=1&t=6

You can see they are got a split second apart. If I change the script as follows.

// Determine which header to send. 
$parts = explode('.', $tool->filename);
//header("Content-Type: image/{$parts[1]}");
//readfile('files/'.$tool->filename);
echo 1;

Then the browser only reads the file once. Does anyone know why this is?

Answer 1

For testing purposes try starting your firefox from a console via

firefox -safe-mode -no-remote

to temporarily disable all extension. Maybe one of the extensions is causing this.