Re: server name that the user agent used

On 9/14/09 2:11 PM, "Lars Torben Wilson" <torben@php.net> wrote: > Tom Worster wrote: >> On 9/13/09 10:24 PM, "Tommy Pham" <tommyhp2@yahoo.com> wrote: >> >>> --- On Sun, 9/13/09, Tom Worster <fsb@thefsb.org> wrote: >>> >>>> From: Tom Worster <fsb@thefsb.org> >>>> Subject: [PHP] server name that the user agent used >>>> To: "PHP General List" <php-general@lists.php.net> >>>> Date: Sunday, September 13, 2009, 8:21 PM >>>> when using apache with one vhost that >>>> responds to a few different hostnames, >>>> e.g. domain.org, y.domain.org, x.domain.org, let's say the >>>> vhost's server >>>> name is y.domain.org and the other two are aliases, is >>>> there a way in php to >>>> know which of these was used by the user agent to address >>>> the server? >>>> >>> Did you see what comes up with php_info() for >>> $_SERVER["SERVER_NAME"] or $_SERVER["HTTP_HOST"] ? >> >> SERVER_NAME returns whatever apache has as the vhost's configured server >> name. >> >> the php manual says of HTTP_HOST: "Contents of the Host: header from the >> current request, if there is one." in which the last 4 words are a little >> off-putting. but: >> >> >> http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.23 >> >> i much more encouraging. the field is mandatory and should have what i'm >> looking for. it's absence is cause for a 400. casual testing (with a modern >> non-ie browser) seems to bear this out. >> >> so i'll try using that with fallback to my current techniques if i don't >> find a good value in HTTP_HOST. > > The reason that it might not be available is that PHP is not always > running in a web context. $_SERVER['HOST_NAME'] would have no meaning, > for instance, in the CLI SAPI. > > However, if running under a web SAPI, and if the web server provides the > info, PHP will pass it on to its scripts. and, for the record, in the web environment there's cause for caution using either HTTP_HOST or, if UseCanonicalName is off or you can't be sure of its value, SERVER_NAME: http://shiflett.org/blog/2006/mar/server-name-versus-http-host in my current app, i should be able to match for acceptable values and fall back to defaults on failure.