jacob at knossos
Aug 7, 2012, 6:04 PM
Post #1 of 1
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Apache ModRewrite vodo in .htaccess causing problem for davical URL shortning
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This is more of a comment than anything, but I've encounter a problem
with using URL shorting via the .htaccess mechanism in Davical.
The Davical htdocs directory contains a .htaccess file with the
following lines
# RewriteEngine On
# # Not if it's the root URL. You might want to comment this out if you
# # want to use an explicit /index.php for getting to the admin pages.
# RewriteCond %{REQUEST_URI} !^/$
# RewriteCond %{REQUEST_URI} !^/davical/$
# # Not if it explicitly specifies a .php program, stylesheet or image
# RewriteCond %{REQUEST_URI} !\.(php|css|js|png|gif|jpg)
# # Everything else gets rewritten to /caldav.php/...
# RewriteRule ^(.*)$ /caldav.php$1 [NC,L]
uncommenting these line should enable the rewrite rule in the last line
to shorten caldav URLs to remove the 'caldav.php' reference, eg
http://davical.example.com/caldav.php/user/calender
shortens to
http://davical.example.com/user/calender
However, as the .htaccess is applied on a per directory basis the rule
as it stands will not work, and should instead be:
RewriteRule ^(.*)$ /caldav.php/$1 [NC,L]
But alas....
Using the Thunderbird Lightning client (other Caldav clients I've tried
appear to work ok) reveals an Apache anomaly which can be exposed
through the following steps:
1. Add a Lightning caldav client with a short URL not containing
'caldav.php'
2. Add a new event in Lightning on the new calendar
3. Delete this event (or any other on the calendar)
Lightning responds:
An error occurred when writing to the calendar!
Status Code: 404, Resource not found.
Apaches logs show:
"DELETE /user/calendar/calendar/89ebc301-a4c9-48f9-a08c-ed3c8baa6f14.ics
HTTP/1.1" 404 -
Note the duplicate '/calendar/calendar' in the request URL.
If the original Apache RewriteRule is placed in the apache config file
for the calendar server VirtualHost, rather then the per
directory .htaccess, all is well.
Some Apache discussion have reports of this problem or one similar to it
possibly being addressed by flag on the RewriteRule named 'DPI' (Discard
Path Info), but I've not had any success getting this to work on even
current versions of Apache
https://issues.apache.org/bugzilla/show_bug.cgi?id=38642
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