I have a php script that writes the whole page output (using output buffering and PECL memcache module) to memcache using keys such as: $host$request_uri

[code]
<?php

function memcache_ob($output) {
$time_start = microtime();
$cache_ttl = 300;

$key = trim($_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI']);

$memcache = new Memcache;
$memcache->connect('127.0.0.1', 11211);

if ($cached = $memcache->get($key))
return str_replace('</body>', "<!-- From memcache in ". round(microtime() - $time_start, 4) . " (" . date('r') . ") -->\n</body>", $cached);

$output = str_replace('</body>', "<!-- Generated on " . date('r') . " / key: " . $key . " -->\n</body>", $output);

$memcache->set($key, $output, false, $cache_ttl);

return $output;
}

ob_start('memcache_ob');

?>
[/code]

In nginx, I have the following:

[code]
location ~ \.php$ {
set $memcached_key $host$request_uri;
memcached_pass 127.0.0.1:11211;

default_type text/html;
error_page 404 502 504 405 = @cache_miss;
}

location @cache_miss {
fastcgi_pass 127.0.0.1:9000;
fastcgi_index index.php;

include /etc/nginx/fastcgi_params;
}
[/code]

The problem is that I'm getting garbled text returned by nginx, which looks like this:

[code]
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[/code]