php, $_SERVER & server_name

[Igor Sysoev]

On Mon, Aug 31, 2009 at 02:21:04PM -0700, Cliff Wells wrote:

> On Mon, 2009-08-31 at 14:07 -0700, Michael Shadle wrote:
> > $host is the same as $http_host?
> 
> Yes, because $http_HEADER is available for *all* headers, so even though
> there's already a $host variable, it's also available via the
> generalized $http_host variable:
> 
> http://wiki.nginx.org/NginxHttpCoreModule#.24host
> http://wiki.nginx.org/NginxHttpCoreModule#.24http_HEADER

No, $host gets its value from

1) request line - http://HOST/...,
2) $http_host,
3) $server_name if reques has no "Host" header line.

> > fastcgi_param SERVER_NAME $http_host;
> > 
> > i've had that in there forever.
> > 
> > just like $uri is short for $request_uri right?
> 
> No, $uri and $request_uri are not always equal:
> 
> http://wiki.nginx.org/NginxHttpCoreModule#.24request_uri
> http://wiki.nginx.org/NginxHttpCoreModule#.24uri
> 
> In short, $uri is the *current* URI (after rewrites, redirects, etc),
> $request_uri is the *original* requested URI.

Yes.

> Regards,
> Cliff
> 
> > this should be documented better somewhere
> > 
> > 2009/8/31 Igor Sysoev <is at rambler-co.ru>:
> > > On Mon, Aug 31, 2009 at 03:58:28PM -0500, AMP Admin wrote:
> > >
> > >> I'm trying to list a bunch of domains under server_name.  I'm doing this
> > >> because these domains generate dynamic content based on their name.  it
> > >> seems to work fine except for one thing... $_SERVER['SERVER_NAME'] just
> > >> displays the first server_name entry.
> > >>
> > >> So say we have the following:
> > >>
> > >> server_name   *.example1.com *.example2.com *.example3.com;
> > >>
> > >> echo $_SERVER['SERVER_NAME']; displays *.example1.com regardless which
> > >> domain was entered into the browser.
> > >
> > > You need to change
> > >
> > > -fastcgi_param  SERVER_NAME        $server_name;
> > > +fastcgi_param  SERVER_NAME        $host;
> > >
> > > in fastcgi_params.
> > >
> > >
> > > --
> > > Igor Sysoev
> > > http://sysoev.ru/en/
> > >
> > >
> > 
> -- 
> http://www.google.com/search?q=vonage+sucks
> 

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