A Code That Will Swap Hosts

[Emok]

Hi evryone just wondering if any of you knows a way that if a host is down that is hosting a image for your website. The website will detect this and swap hosts of the image to another host containing the same image

any help would be gratly appriciated

Emok

[zootm]

the problem with this is that it requires you to test the host by seeing if it times out. so if you do detect that the host is down, it'll add a good 5-10 seconds to the page loading time. you'd be better off adding a link that says "alt. source" or something to the bottom.

it can be done in PHP, but i don't know how - i've seen it done (and added code to do it myself) before. but, as i say, it's not a practical thing to really do...

[griffinn]

Say your local website is host-a.com, and your image is mirrored as http://host-b.com/img.gif, http://host-c.com/img.gif and http://host-d.com/img.gif.

Then you can set up a script like this on host-a.com:

PHP Code:

<?
$img = file_get_contents('http://host-b.com/img.gif')
        or file_get_contents('http://host-c.com/img.gif')
        or file_get_contents('http://host-d.com/img.gif')
        or die('Cannot get image');

header('Content-type: image/gif');
echo $img;
?>

Save this in, say, mirrored-img.php on host-a. Then your web pages can use <img src="http://host-a.com/mirrored-img.php"> to get the file from one of those three sites.

Adapt accordingly. Ideas: (1) Use GET variables to make that script grab any named mirrored file; (2) Build some intelligence into that script to discover the file type and output suitable content-type headers; (3) Randomise the order in which the mirroring hosts are contacted so you get load-balancing, sort of.

You still have to set up the mirroring yourself, of course.

[Emok]

Cherz Evryone