RE: How to select the directory index file for load balancing?

Hi there;

Quick question:

While debugging a slightly different problem, we came across something that
looked like mod_backhand interfering with sub requests. We just assumed that
it was trying to handle them. When mod_dir does a 'fake' request to get the
uri.... Eg:

  request_rec *rr = ap_sub_req_lookup_uri(name_ptr, r); (see my previous
post)

Why does mod_backhand prepend "backhand:" to the uri? .... Eg:

  char *new_uri = ap_escape_uri(r->pool, rr->uri);

Here, new_uri will equal "backhand: /mydir/file.cgi" - which in our tests,
has caused 404 errors to be returned.

This is what we were hoping to change. Ie, get mod_backhand not to add the
"backhand:" when apache is doing an ap_sub_req_lookup_uri. In the meantime,
we've hacked mod_dir to simply drop the "backhand:", and it seems to work
okay. We've not looked into changing mod_backhand yet to see how difficult
it would be, but I'll keep you posted. We're no apache experts, so  any
advice would be gratefully received!

Cheers
Bryan

> -----Original Message-----
> From: [email protected] 
> [mailto:[email protected]] On Behalf Of 
> Theo Schlossnagle
> Sent: Wednesday, October 29, 2003 2:23 PM
> To: [email protected]
> Cc: Theo Schlossnagle
> Subject: Re: [m_b_users] How to select the directory index 
> file for load balancing?
> 
> I'm just fishin' here... But I think it has to do with the 
> way mod_backhand handles apache internal subrequests.
> 
> mod_backhand will only try to load balance things that are 
> initial requests.  Here, the initial request is / and then it 
> is expanded with DirectoryIndex to /index.php which is issues 
> into apache as an internal sub request, which mod_backhand 
> will not attempt to load balance.
> 
> This behaviour was selected to allow mod_backhand to 
> peacefully coexist with modules like mod_gzip.
> 
> One way is to work around this is to use mod_rewrite.  I 
> think you can rewrite all / to index.php with a 302 and that 
> will work like a charm.  
> If that isn't a desirable approach, then someone more clever 
> than me can try to change mod_backhand to handle subrequests too...
> 
> On Oct 29, 2003, at 9:08 AM, Thomas Buehren wrote:
> 
> > Hello again,
> >
> > having read the mail of Bryan Ross who also has problems with the 
> > DirectoryIndex, I wonder if my problem of how to load balance the 
> > directory index file might result from a mod_backhand error:
> >
> > This works with the directory index file index.php 
> (http://DOMAINNAME/ 
> > returns a 403 forbidden):
> >
> >  <Directory "/usr/local/httpd/htdocs/genieuk">
> >    <Files ~ "(\.php3|\.php)$">
> >     Order allow,deny
> >     Deny from all
> >    </Files>
> >  </Directory>
> >
> > So, the Files statement seems to include my index.php 
> directory index 
> > file.
> > BUT this does not work with index.php 
> (http://DOMAINNAME/index.php is 
> > load balanced, but http://DOMAINNAME/ is always executed on the 
> > original
> > server):
> >
> >  <Directory "/usr/local/httpd/htdocs/genieuk">
> >    <Files ~ "(\.php3|\.php)$">
> >      Backhand byAge
> >      Backhand byRandom
> >      Backhand byLoad -3.0
> >    </Files>
> >  </Directory>
> >
> > Does anyone know how to enable load balancing for 
> http://DOMAINNAME/?
> >
> > Thomas
> >
> >
> >> -----Original Message-----
> >> From: [email protected]
> >> [mailto:[email protected]]On Behalf 
> Of Thomas 
> >> Buehren
> >> Sent: Sunday, October 26, 2003 1:25 PM
> >>
> >> Hello,
> >>
> >> probably a simple question for you, but I could not find a 
> solution:
> >>
> >> I use backhand to load-balance php requests. All the rest 
> should be 
> >> processed by the original server. The "Files" selection in the 
> >> configuration below does that for me.
> >>
> >> The problem: The directory index file "index.php" is not load 
> >> balanced if the request is "http://DOMAINNAME/", it only works as 
> >> "http://DOMAINNAME/index.php". How can I modify the 
> selection (or add
> >> another) to capture the directory index php file when it 
> is not given 
> >> in the URL? (Apache/1.3.20 mod_backhand/1.2.0)
> >>
> >> I would be grateful for any help.
> >>
> >> Thomas
> >>
> >>
> >> DirectoryIndex index.jsp index.php3 index.html index.htm
> >>
> >> <VirtualHost IPADDRESS:80>
> >>     ServerAdmin [email protected]
> >>     DocumentRoot /usr/local/httpd/htdocs/genieuk
> >>     ServerName DOMAINNAME
> >>
> >>     ErrorLog  "|rotatelogs
> >> /usr/local/httpd/htdocs/genieuk/stats/error_log
> >> 86400"
> >>     CustomLog "|rotatelogs
> >> /usr/local/httpd/htdocs/genieuk/stats/access_log
> >> 86400" combined
> >>
> >>     AddType application/x-httpd-php .php3
> >>     <Directory "/usr/local/httpd/htdocs/genieuk">
> >>       <Files ~ "(\.php3|\.php)$">
> >>         Backhand byAge
> >>         Backhand byRandom
> >>         Backhand byLoad -3.0
> >>       </Files>
> >>     </Directory>
> >> </VirtualHost>
> >
> >
> > _______________________________________________
> > backhand-users mailing list
> > [email protected]
> > http://lists.backhand.org/mailman/listinfo/backhand-users
> >
> // Theo Schlossnagle
> // Principal Engineer -- http://www.omniti.com/~jesus/ // 
> Postal Engine -- http://www.postalengine.com/ // Ecelerity: 
> fastest MTA on earth
> 
> 
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