Django/Apache/mod_wsgi: How do I specify the SCRIPT_NAME for non-root URLs?

[Tyler Erickson]

I am trying to use Apache and mod_wsgi to serve multiple django
sites. The django sites are served up fine when at the root URL, but
when served from a sub-URL the portion of the the URL consumed by
Apache disappears from any links created in the django site pages.
From reading throught the WSGI spec (http://www.wsgi.org/wsgi/
Specifications/routing_args), it appears that I need to specify the
SCRIPT_NAME environment variable, but I am not sure where I should do
that. (The apache/django.wsgi file seemed like a logical place to set
the SCRIPT_NAME environment variable, but that seems to have no effect
on the generated URLs.)

Below is a description of my setup, and the apache and WSGI
configuration files.

- Tyler

OS: Ubuntu 9.04
django: 1.1 SVN-11733
apache: 2.2.11-2ubuntu2.3
libapache2-mod-wsgi: 2.3-1build1

#############################################
Apache configuration file (default)
#############################################
<VirtualHost *:80>
ServerAdmin webmaster@localhost

###############################################################
# Configuration for the olwidget test project
###############################################################
Alias /olwidget/site_media/ "/usr/local/olwidget/trunk/olwidget/
django-olwidget/test_project/site_media/"
<Directory "/usr/local/olwidget/trunk/olwidget/django-olwidget/
test_project/site_media/">
Order allow,deny
Options Indexes
Allow from all
IndexOptions FancyIndexing
</Directory>

Alias /olwidget/media/ "/usr/local/lib/python2.6/dist-packages/
django/contrib/admin/media/"
<Directory "/usr/local/lib/python2.6/dist-packages/django/contrib/
admin/media/">
Order allow,deny
Options Indexes
Allow from all
IndexOptions FancyIndexing
</Directory>

WSGIScriptAlias /olwidget /usr/local/olwidget/trunk/olwidget/
django-olwidget/test_project/apache/django.wsgi
<Directory /usr/local/olwidget/trunk/olwidget/django-olwidget/
test_project/apache>
Order deny,allow
Allow from all
</Directory>

###############################################################
# Configuration for WFEIS
###############################################################
Alias /wfeis/site_media/ "/usr/local/django_nasa_fire_dss/
site_media/"
<Directory "/usr/local/django_nasa_fire_dss/site_media/">
Order allow,deny
Options Indexes
Allow from all
IndexOptions FancyIndexing
</Directory>

Alias /wfeis/media/ "/usr/local/lib/python2.6/dist-packages/django/
contrib/admin/media/"
<Directory "/usr/local/lib/python2.6/dist-packages/django/contrib/
admin/media/">
Order allow,deny
Options Indexes
Allow from all
IndexOptions FancyIndexing
</Directory>

WSGIScriptAlias /wfeis /usr/local/django_nasa_fire_dss/apache/
django.wsgi
<Directory /usr/local/django_nasa_fire_dss/apache>
Order deny,allow
Allow from all
</Directory>

</VirtualHost>

#############################################
Example WSGI configuration file
(/usr/local/olwidget/trunk/olwidget/django-olwidget/test_project/
apache/django.wsgi)
#############################################
import os
import sys
os.environ['DJANGO_SETTINGS_MODULE'] = 'test_project.settings'
os.environ['SCRIPT_NAME'] = 'olwidget'
# append the django project root directory to the python path
sys.path.append('/usr/local/olwidget/trunk/olwidget/django-olwidget')
sys.path.append('/usr/local/olwidget/trunk/olwidget/django-olwidget/
test_project')
import django.core.handlers.wsgi
application = django.core.handlers.wsgi.WSGIHandler()

[Karen Tracey]

On Wed, Jan 6, 2010 at 2:39 PM, Tyler Erickson <tyler...@gmail.com> wrote:

I am trying to use Apache and mod_wsgi to serve multiple django
sites.  The django sites are served up fine when at the root URL, but
when served from a sub-URL the portion of the the URL consumed by
Apache disappears from any links created in the django site pages.
From reading throught the WSGI spec (http://www.wsgi.org/wsgi/
Specifications/routing_args), it appears that I need to specify the
SCRIPT_NAME environment variable, but I am not sure where I should do
that.  (The apache/django.wsgi file seemed like a logical place to set
the SCRIPT_NAME environment variable, but that seems to have no effect
on the generated URLs.)

It should Just Work, no need to set any environment variables.  There have been a couple of threads recently similar to this:

http://groups.google.com/group/django-users/browse_thread/thread/ce1436670a3c55d5/
http://groups.google.com/group/django-users/browse_thread/thread/e790664ee1855647/

The first identified a Django problem in a very specific case (reverses called during processing of requests for the project root url without a trailing slash).  The cause of the second I don't recall seeing an answer on. When I try it, it works for me, excepting the one case identified in the first thread.  There is a fair amount of debugging advice to be found in those threads, so perhaps they will help you in tracking down what is going wrong in your case.

Karen

[Tyler Erickson]

I added the WSGI logging middleware to write to the Apache log as
described in:
http://code.google.com/p/modwsgi/wiki/DebuggingTechniques#Tracking_Request_and_Response
and yes it appears that my SCRIPT_NAME environment variable is being
automatically set (see excerpts below). So I guess it is Django or my
Django project that is causing the problem...

- Tyler

[Fri Jan 08 14:15:16 2010] [error] [client 198.111.191.240]
'PATH_INFO': '',
[Fri Jan 08 14:15:16 2010] [error] [client 198.111.191.240]
'REQUEST_URI': '/olwidget',
[Fri Jan 08 14:15:16 2010] [error] [client 198.111.191.240]
'SCRIPT_NAME': '/olwidget',

[Fri Jan 08 14:14:14 2010] [error] [client 198.111.191.240]
'PATH_INFO': '/',
[Fri Jan 08 14:14:14 2010] [error] [client 198.111.191.240]
'REQUEST_URI': '/olwidget/',
[Fri Jan 08 14:14:14 2010] [error] [client 198.111.191.240]
'SCRIPT_NAME': '/olwidget',

[Fri Jan 08 14:16:27 2010] [error] [client 198.111.191.240]
'PATH_INFO': '/test/test',
[Fri Jan 08 14:16:27 2010] [error] [client 198.111.191.240]
'REQUEST_URI': '/olwidget/test/test',
[Fri Jan 08 14:16:27 2010] [error] [client 198.111.191.240]
'SCRIPT_NAME': '/olwidget',

[Tyler Erickson]

Fixed it.
It turned out to be a problem with how the django project templates
were written. Both of the projects that I was experimenting with were
using hardcorded href values, instead of using a url template tag.

hardcoded example:
<a href='/test/styleinfo/'>Per-geometry styles</a>

url template tag example:
<a href={% url testolwidget.views.style_infomodel %}>Per-geometry
styles</a>

reference:
http://docs.djangoproject.com/en/1.1/ref/templates/builtins/#url