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Re: URL encoding issue

February 16, 2011 08:41AM

> Hello!
> Some background: nginx do location matching on
> unescaped URI path.
> So you have unescaped data in your variables.
> And there are two separate issues here:


> 2. When doing proxy_pass nginx do escape
> characters which aren't
> valid in URI, but it doesn't to escape some chars
> which aren't
> (like "<", ">", <">). That's why you see space
> escaped, but not
> <">.

[ ... ]

> Maxim Dounin
> _______________________________________________
> nginx mailing list
> nginx@nginx.org
> http://nginx.org/mailman/listinfo/nginx

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 (\: #<Mongrel::HttpParserError: Invalid HTTP format, parsing fails.>
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;

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.

Is there any documentation supporting the official behavior adopted by nginx in a reverse proxy + special characters in URL situation? I believe this is a (major) bug in the HttpProxy module, as it basically prevents use of nginx in front of any application that uses special characters in URLs. Does anyone know how to handle this issue?

I'm using nginx on debian. "apt-cache show nginx" gives me the following version number: "Version: 0.6.32-3+lenny3".

André Caron
Subject Author Posted

URL encoding issue

Harish Sundararaj April 15, 2010 06:46AM

Re: URL encoding issue

Maxim Dounin April 15, 2010 08:50PM

Re: URL encoding issue

acaron February 16, 2011 08:41AM

Re: URL encoding issue

Igor Sysoev February 16, 2011 09:02AM

Re: URL encoding issue

Maxim Dounin February 16, 2011 09:22AM

REDIS2 Addon, Query LRANGE Support?

Alexander Kunz February 16, 2011 01:18PM

Re: REDIS2 Addon, Query LRANGE Support?

Alexander Kunz February 16, 2011 02:44PM

Re: URL encoding issue

acaron February 20, 2011 12:18AM

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