Arjun Datta wrote:
> Hi Folks,
>
> Simple question,
>
> I was reading the documentation for mod_proxy module in version 2.2 on the
> apache.org website and I was a little confused by the difference between
> forward and reverse proxies.
>
> My understanding:
> Forward returns the addresses and reverse (default) returns the content. Is
> this true ?
>
> Regards,
> Arjun
>
> -----Original Message-----
> From: jslive@xxxxxxxxx [mailto:jslive@xxxxxxxxx]On Behalf Of Joshua
> Slive
> Sent: Thursday, September 07, 2006 9:36 AM
> To: users@xxxxxxxxxxxxxxxx
> Subject: Re: [users@httpd] Dynamic RewriteRule based on the URL
>
>
> On 9/7/06, Norman Khine <norman@xxxxxxxxx> wrote:
>
>
>> [1] <VirtualHost *:80>
>>
>> [2] ServerName domain.tld
>> [3] RewriteEngine on
>> [4] RewriteCond %{*HTTP_HOST*} *[^.]+*\.domain\.tld$
>> [5] RewriteRule ^(.+) %{HTTP_HOST}$1
>>
> [C]
>
>> [6] RewriteRule *([^.]+)*\.domain\.tld(.*)
>>
> http://localhost:9080/*$1*$2 [P]
>
>> [7] RequestHeader set X-Base-Path %{*HTTP_HOST*}
>>
>> [8] ErrorLog /var/log/apache2/all-error_log
>> [9] CustomLog /var/log/apache2/all-access_log common
>>
>> [0] </VirtualHost>
>>
>>
>> I don't understand line [2], as the server gets the request
>>
> http://folder.domain.tld as this points to an A record IP address Apache
> will return the default page and it stops, how do I inject the
> %{*HTTP_HOST*} value or is there some magic I am missing and don't see?
>
>> Assuming that there is, Apache then switches the RewriteEngine on [3] and
>>
> takes everything before domain.tld - what is the meaning of [^.]+ ? then the
> [C] means continue to the next RewriteRule which in my case needs to rewrite
> to an internal server and Proxy this i.e. [P], but this does not work for me
> either ;'(
>
>> Line [7] I need to set the X-Base-Path to the folder name.
>>
>> I would like to avoid using vhost.map or any scripting but I am open to
>>
> suggestions if there is no other way ;)
>
>> By the way, I don't have the www.'folder'.domain.tld in my URL - maybe
>>
> this is the problem, but don't see why?
>
> I don't understand that last line. But here is something that should be
> closer:
> <VirtualHost *:80>
> ServerName domain.tld
> ServerAlias *.domain.tld
> RewriteEngine on
> RewriteCond %{HTTP_HOST} ^([a-zA-Z_]+\.domain\.tld)$
> RewriteRule (.+) http://localhost:9080/%1$1 [P,E=THEHOST:%1]
>
> RequestHeader set X-Base-Path %{THEHOST}e
> ErrorLog /var/log/apache2/all-error_log
> CustomLog /var/log/apache2/all-access_log common
> </VirtualHost>
>
> I don't know if this will work, but it is closer than what you have.
> A few notes:
> 1. My regex matching the HOST is more strict to avoid clients playing
> funny games with their host header and causing security problems. It
> accepts only hostnames containing letters and the underscore
> character.
> 2. In the RewriteRule %1 matches the regex from the RewriteCond and $1
> matches the regex from the RewriteRule.
> 3. The funky stuff with THEHOST is necessary because the RequestHeader
> directive cannot access mod_rewrite variables. So I instead have
> mod_rewrite shove HTTP_HOST in an environment variable.
>
> One more note: I'm not actually sure whether RequestHeader can use env
> variables at all. You'd need to check the code to be sure.
>
> Joshua.
>
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>
Hi,
here is a good explanation of the differences.
http://apache.active-venture.com/mod/mod_proxy2.html
Cheers
Norman
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