upstream proxy support

[Maxim Dounin]

Hello!

On Fri, Mar 22, 2013 at 03:12:23PM +0100, Bernd Rössl wrote:

> hi,
> 
> currently there is no way to rewrite to a url containing a schema and
> proy_passing the request to a upstream since such a rewrite will end
> up in a redirect. This is a problem if nginx is running behind a proxy
> like squid which uses abolute url's to pass the request to. however,
> absolute uri's are valid in requests and commonly used in proxies, for
> details see http://www.w3.org/Protocols/rfc2616/rfc2616-sec5.html#sec5.1.2
> 
> attached is a patch with a fix for ngx_http_rewrite_module.c which
> introduces a new flag for the rewrite directive called "noredirect" to
> allow redirect targets containing a schema
> 
> in config this will look like this:
> 
> location = '/foo' {
>     rewrite  .*  "http://www.example.com/bar" noredirect;
>     proxy_pass http://squid-host;
> }

Rewrite is expected to set r->uri, which in turn expected to 
contain path component of a full URL.  It is bad idea to introduce 
flags which allow to violate this.

Instead, if you need an ability to better control request line 
used, you may want to address this in proxy module.

-- 
Maxim Dounin
http://nginx.org/en/donation.html