URL encoding issue

[Igor Sysoev]

On Wed, Feb 16, 2011 at 08:41:14AM -0500, acaron wrote:
> 
> I have a simple setup where I use nginx as a frontend to proxy multiple
> other applications (Django, Rails, etc.), some through FastCGI, some
> through use of the HTTP reverse proxy.  I'm very satisfied of the
> software you guys have come up with, especially after having been
> tortured by Apache...
> 
> I've recently purchased a business license for http://yuml.me/.  I've
> installed it using Mongrel and nginx uses the HTTP reverse-proxy to
> delegate requests.  The setup "works" in that I can access the different
> pages.  However, all UML diagram URLs are broken and return a "502 --
> bad gateway" message.
> 
> Entries in the nginx log look like (note the URL in **encoded** form): 
> 
> xxx.xxx.xxx.xxx - - [16/Feb/2011:07:50:28 -0500] "GET
> /diagram/scruffy/class/%5BC\ustomer%5D%2B1-%3E*%5BOrder%5D%2C%20%5BOrder%5D%2B%2B1-items%20%3E*%5BLineItem%\5D%2C%20%5BOrder%5D-0..1%3E%5BPaymentMethod%5D
> HTTP/1.1" 502 173 "-" "Mozilla/5\.0 (Windows; U; Windows NT 6.1; en-US)
> AppleWebKit/534.13 (KHTML, like Gecko) C\hrome/9.0.597.98
> Safari/534.13"
> 
> And the mongrel log for the same query looks like (note the URL in
> **decoded** form):
> 
> Wed Feb 16 07:50:28 -0500 2011: HTTP parse error, malformed request
> (127.0.0.1)\: #
> Wed Feb 16 07:50:28 -0500 2011: REQUEST DATA: "GET
> /diagram/scruffy/class/[Cust\omer]+1->*[Order],%20[Order]++1-items%20>*[LineItem],%20[Order]-0..1>[PaymentMe\thod]
> HTTP/1.0\r\nHost: yuml.eaddrinuse.ca\r\nConnection: close\r\nAccept:
> appl\ication/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/\*;q=0.5\r\nUser-Agent:
> Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWeb\Kit/534.13
> (KHTML, like Gecko) Chrome/9.0.597.98 Safari/534.13\r\nAccept-Encodi\ng:
> gzip,deflate,sdch\r\nAccept-Language: en-US,en;q=0.8\r\nAccept-Charset:
> ISO\-8859-1,utf-8;q=0.7,*;q=0.3\r\n\r\n"
> 
> Here the entire configuration for this virtual host (note the proxy_pass
> directive):
> 
> server {
>     # virtual host name.
>   server_name xxx.xxx.xxx;
> 
>     # listening on standard port.
>   listen 80;
> 
>     # don't require 'sudo' to read log file.
>   access_log /home/webserver/www/hosts/yuml/access.log;
> 
>     # empty, but still provided for isolation.
>   root /home/webserver/www/hosts/yuml/root/;
> 
>     # yUML: static files + proxied Ruby on Rails application.
>   location /stylesheets/ {
>     root /home/webserver/www/hosts/yuml/root/;
>   }
>   location /images/ {
>     root /home/webserver/www/hosts/yuml/root/;
>   }
>   location /javascripts/ {
>     root /home/webserver/www/hosts/yuml/root/;
>   }
>   location / {
>     #proxy_set_header X-Real-IP $remote_addr;
>     #proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
>     proxy_set_header Host $http_host;
>     proxy_redirect false;
>     proxy_pass http://127.0.0.1:9001/;
>   }
> }
> 
> As you can see I'm not using any modification whatsoever on the URL
> before passing it to the proxy server.  Yet, nginx passes the request
> using a remote URL in decoded URL form (thus, a rightfully invalid URL).
>  According to Maxim's post, I understand this should not be the case.

You need to delete the last slash:

   location / {
      ...
-     proxy_pass http://127.0.0.1:9001/;
+     proxy_pass http://127.0.0.1:9001;
   }

in this case nginx passes a request URI unchanged.


-- 
Igor Sysoev
http://sysoev.ru/en/