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?
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--- On Sun, 9/13/09, Tom Worster
> From: Tom Worster
> Subject: [PHP] server name that the user agent used
> To: "PHP General List"
> 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"] ?
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>
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On 9/13/09 10:24 PM, "Tommy Pham"
> --- On Sun, 9/13/09, Tom Worster
>
>> From: Tom Worster
>> Subject: [PHP] server name that the user agent used
>> To: "PHP General List"
>> 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.
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On 9/14/09 9:03 AM, "Tom Worster"
> On 9/13/09 10:24 PM, "Tommy Pham"
>
>> --- On Sun, 9/13/09, Tom Worster
>>
>>> From: Tom Worster
>>> Subject: [PHP] server name that the user agent used
>>> To: "PHP General List"
>>> 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.
>
extra info: the Host: header isn't in HTTP/1.0, hence those off-putting 4
words, i guess.
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Tom Worster wrote:
> On 9/13/09 10:24 PM, "Tommy Pham"
>
>> --- On Sun, 9/13/09, Tom Worster
>>
>>> From: Tom Worster
>>> Subject: [PHP] server name that the user agent used
>>> To: "PHP General List"
>>> 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.
Regards,
Torben
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On 9/14/09 2:11 PM, "Lars Torben Wilson"
> Tom Worster wrote:
>> On 9/13/09 10:24 PM, "Tommy Pham"
>>
>>> --- On Sun, 9/13/09, Tom Worster
>>>
>>>> From: Tom Worster
>>>> Subject: [PHP] server name that the user agent used
>>>> To: "PHP General List"
>>>> 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-ho st
in my current app, i should be able to match for acceptable values and fall
back to defaults on failure.
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