$memcached_key doesn't fetch unicode url

Server NGINX
#1

Hi,

I’m doing some sort of downstream cache that I save every entire page
into
memcached from the application with urls such as:

www.example.com/file/path/?query=1

then I’m fetching them from nginx if available with the config:
location / {
# try to fetch from memcached
set $memcached_key “$host$request_uri”;
memcached_pass localhost:11211;
expires 10m;
# not fetched from memcached, fallback
error_page 404 405 502 = @fallback;
}

This works perfectly fine for latin char urls. However, it fails to
catch
unicode urls such as:

www.example.com/flights/istc-lonc-11062014/lonc-istc-19062014/Cheap-return-tickets-from-İstanbul-to-Londra-in-Haziran.html?class=economy&adult=1

The unicode char “%C4%B0” appears same in the nginx logs, application
cache
setting key (that is actually taken from raw REQUEST_URI what nginx
gives).

The example url content also exist in the memcached itself when if I
try:
"get
www.example.com/flights/istc-lonc-11062014/lonc-istc-19062014/Cheap-return-tickets-from-İstanbul-to-Londra-in-Haziran.html?class=economy&adult=1
"

However, nginx cannot fetch anything from memcached, @fallbacks every
time.

I’m using version 1.6.0. Any help is much appreciated.

Roy.

#2

Hello!

On Sun, May 04, 2014 at 06:42:39PM +0300, kirpit wrote:

    set                 $memcached_key "$host$request_uri";

www.example.com/flights/istc-lonc-11062014/lonc-istc-19062014/Cheap-return-tickets-from-İstanbul-to-Londra-in-Haziran.html?class=economy&adult=1

I’m using version 1.6.0. Any help is much appreciated.

Value of $memcached_key is escaped to make sure memcached protocol
constraints are not violated - most notably, space and “%”
character are escaped into “%20” and “%25”, respectively (space is
escaped as it’s not allowed in memcached keys, and “%” to make the
escaping reversible).

Given the

www.example.com/flights/istc-lonc-11062014/lonc-istc-19062014/Cheap-return-tickets-from-İstanbul-to-Londra-in-Haziran.html?class=economy&adult=1

$memcached_key, nginx will try to fetch

www.example.com/flights/istc-lonc-11062014/lonc-istc-19062014/Cheap-return-tickets-from-%C4%B0stanbul-to-Londra-in-Haziran.html?class=economy&adult=1

from memcached.

–
Maxim D.
http://nginx.org/

#3

A note to the history that is good to know.

Thanks Maxim, even though we choose not to use unicode urls to make
things
less complicated.