id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	uname	nginx_version
508	nginx rewrite URL decoding first encoded character in URI	Jerry Hoffmeister		"I have rules like the following:

    location /trk/ {
        if ($args ~ ""url=(.*)"" ) {
            set $url $1;
            rewrite click.gif$ $url? redirect;
            rewrite redirect.gif$ $url? redirect;
        }
    }

problem is if I have a request like:

http://localhost/trk/click.gif?some_foo&url=http://www.foo.com/%3Fmore_foo%3F

it gets rewritten to

http://www.foo.com/?more_foo%3F

and I need the first %3F to not get decoded to ?

It appears to decode the FIRST and only the first encoded character it finds...

I've tried this with several version of nginx (1.1.13, 1.3.2 and 1.5.10) - output of nginx -V is below for 1.5.10.

here's the issue:
{{{
ubuntu@Nginx-Test-Zusw1b-S01:~$ GET -Sd ""http://localhost/trk/click.gif?some_foo&url=http://www.foo.com/%3Fmore_foo%3F""
GET http://localhost/trk/click.gif?some_foo&url=http://www.foo.com/%3Fmore_foo%3F --> 302 Moved Temporarily
GET http://www.foo.com/?more_foo%3F --> 200 OK
}}}
Maybe this is a ""feature"" but I'm unable to find it documented anywhere nor do have I found a way to ""turn it off"""	defect	new	major		nginx-core	1.5.x				Linux Nginx-Test-Zusw1b-S01 2.6.38-13-virtual #57-Ubuntu SMP Mon Mar 5 21:49:53 UTC 2012 i686 i686 i386 GNU/Linux	"nginx version: nginx/1.5.10
built by gcc 4.5.2 (Ubuntu/Linaro 4.5.2-8ubuntu4)
TLS SNI support enabled
configure arguments: --with-http_ssl_module --with-http_stub_status_module --with-http_realip_module --prefix=/opt/nginx-1.5.10 --http-client-body-temp-path=/var/opt/nginx/client_body_temp --http-fastcgi-temp-path=/var/opt/nginx/fastcgi_temp --http-proxy-temp-path=/var/opt/nginx/proxy_temp --http-scgi-temp-path=/var/opt/nginx/scgi_temp --http-uwsgi-temp-path=/var/opt/nginx/uwsgi_temp
"