RewriteRule and VirtualDocumentRoot: How do they interract ?

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Greetings,

===3D Context ===3D

I recently had to write a rewrite rule and after a few fail, decided to rea=
d=20
carefully online documentation. After understanding the base problem of=20
RewriteRule in .htaccess files (which I did experiment), I put a rule in th=
e=20
vhost config file.

The rule seems to work since the pattern is match and the location is=20
correctly rewrited. What I don't understand is that after the substitution,=
=20
apache look for the file by prepending document_root (/htdocs on my server)=
to=20
the substitution. But I use VirtualDocumentRoot and no DocumentRoot so that=
my=20
files are usually accessed via the value of VirtualDocumentRoot.

So here is the question :

===3D Question ===3D

Why does apache not use the value of VirtualDocumentRoot to prepend=20
RewriteRule substitutions ? I found this bug report=20
https://issues.apache.org/bugzilla/show_bug.cgi?id=3D26052 which seems quit=
e=20
close to what I am experiencing except that users complains more about effe=
cts=20
on PHP scripts.

===3D My server configuration ===3D

VirtualDocumentRoot /srv/www/%-2.0.%-1/%-3+/
RewriteRule ^/(.*)/chapitre-([0-9]*)-([a-z]*)\.poule$=20
/$1/index.php?id=3D$2&lang=3D$3

URI accessed : http://plume.hadaly.fr/collections/recherche/sujet/chapitre- =
78-
fr.poule

I don't paste the other informations as they seems to me irrelevant for thi=
s=20
concern. This rule works with a [R] flag fail with the following logs :

132.227.76.62 - - [14/Jan/2010:18:22:24 +0100] [plume.hadaly.fr/sid#24a33f0]
[rid#279b258/initial] (2) init rewrite engine with requested uri=20
/collections/recherche/sujet/chapitre-78-fr.poule
132.227.76.62 - - [14/Jan/2010:18:22:24 +0100] [plume.hadaly.fr/sid#24a33f0]
[rid#279b258/initial] (3) applying pattern '^/(.*)/chapitre-([0-9]*)-([a-
z]*)\.poule$' to uri '/collections/recherche/sujet/chapitre-78-fr.poule'
132.227.76.62 - - [14/Jan/2010:18:22:24 +0100] [plume.hadaly.fr/sid#24a33f0]
[rid#279b258/initial] (2) rewrite '/collections/recherche/sujet/chapitre-78-
fr.poule' -> '/collections/recherche/sujet/index.php?id=3D78&lang=3Dfr'
132.227.76.62 - - [14/Jan/2010:18:22:24 +0100] [plume.hadaly.fr/sid#24a33f0]
[rid#279b258/initial] (3) split=20
uri=3D/collections/recherche/sujet/index.php?id=3D78&lang=3D fr ->=20
uri=3D/collections/recherche/sujet/index.php, args=3Did=3D78&lang=3Dfr
132.227.76.62 - - [14/Jan/2010:18:22:24 +0100] [plume.hadaly.fr/sid#24a33f0]
[rid#279b258/initial] (2) local path result:=20
/collections/recherche/sujet/index.php
132.227.76.62 - - [14/Jan/2010:18:22:24 +0100] [plume.hadaly.fr/sid#24a33f0]
[rid#279b258/initial] (2) prefixed with document_root to=20
/htdocs/collections/recherche/sujet/index.php
132.227.76.62 - - [14/Jan/2010:18:22:24 +0100] [plume.hadaly.fr/sid#24a33f0]
[rid#279b258/initial] (1) go-ahead with=20
/htdocs/collections/recherche/sujet/index.php [OK]

The most interesting part to me is the local path result which is coherent =
if=20
it is prepended by the VirtualDocumentRoot value and the message "prefixed =
with=20
document_root".

What does I wrongly assume or understand ?

Thanks for you help or any advice.

Best regards,

Thomas Preud'homme

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Re: RewriteRule and VirtualDocumentRoot: How do they

On 1/14/10, Thomas Preud'homme wrote:
> Greetings,
>
> === Context ===
> What I don't understand is that after the substitution,
> apache look for the file by prepending document_root (/htdocs on my server) to
> the substitution. But I use VirtualDocumentRoot and no DocumentRoot so that my
> files are usually accessed via the value of VirtualDocumentRoot.

See the PT flag + using a URL-path in your substitution instead of a
filesystem path.

PT is implicit in per-directory. It's what allows "other" modules to
to a URL->filesystem mapping, otherwise they don't see the output of
your rewrite.

--
Eric Covener
covener@gmail.com

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Re: RewriteRule and VirtualDocumentRoot: How do they interract ?

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Le jeudi 14 janvier 2010 19:53:09, Eric Covener a =E9crit :
> On 1/14/10, Thomas Preud'homme wrote:
> > Greetings,
> >
> > ===3D Context ===3D
> > What I don't understand is that after the substitution,
> > apache look for the file by prepending document_root (/htdocs on my
> > server) to the substitution. But I use VirtualDocumentRoot and no
> > DocumentRoot so that my files are usually accessed via the value of
> > VirtualDocumentRoot.
>=20
> See the PT flag + using a URL-path in your substitution instead of a
> filesystem path.
I thought RewriteRule with a full URL path was striping the http://server p=
art=20
(I get it from the doc). So what is the difference with only matching the=20
remaining part of the URL ? The result of the rule I wrote is a valid URL i=
f=20
prepended by http://myserver
>=20
> PT is implicit in per-directory. It's what allows "other" modules to
> to a URL->filesystem mapping, otherwise they don't see the output of
> your rewrite.
>=20
=46rom the doc :


This flag is just a hack to enable post-processing of the output of Rewrite=
Rule=20
directives, using Alias, ScriptAlias, Redirect, and other directives from=20
various URI-to-filename translators

If I understand well (correct me if I'm wrong), after RewriteRule has appli=
ed,=20
the result is understood as a file path, that's why others directives (such=
as=20
Alias, Redirect and so on) don't apply on the result. But why is the=20
DocumentRoot prepended to the result, is it because it's in the core apache=
=20
and not a module ?

I don't use any of this directives in this vhost (I use them but only for=20
other vhost) for the moment. Is it also valid for handling VirtualDocumentR=
oot=20
?

Sorry for all my questions, I'd rather understand mechanisms that just maki=
ng=20
the change and miss something important.

Best regards,

Thomas Preud'homme

P.S. : This mailing list system should set X-Mailing-List mail header to al=
low=20
proper reply to the list with good MUA

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RE: RewriteRule and VirtualDocumentRoot: How do theyinterract ?

> From the doc :
>=20
>=20
> This flag is just a hack to enable post-processing of the output of
> RewriteRule directives, using Alias, ScriptAlias, Redirect, and other
> directives from various URI-to-filename translators
>=20
> If I understand well (correct me if I'm wrong), after RewriteRule has
> applied, the result is understood as a file path, that's why others
> directives (such as Alias, Redirect and so on) don't apply on the
> result. But why is the DocumentRoot prepended to the result, is it
> because it's in the core apache and not a module ?

The rewriterule transforms a URI into a new URI.=20


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