[Twisted-web] Nevow URL trouble

Sridhar Ratna sridharinfinity at gmail.com
Sat Feb 26 02:47:23 MST 2005

I am rewriting wsgi.py in nevow.  I face some problems with the nevow
url module.

Firstly, only guard and rootaccessor uses IRequest.getRootURL()

In twisted the root url is always like http://domain.com/ .  In
non-twisted setups like wsgi, it is not so.  And well, nevow is
designed to work with cgi apps too (nevow-deployment.txt)

Consider this cgi/wsgi/nevow setup:


nevowcgi.py will createWSGIApplication and call run_with_cgi. The
wsgi.py module will then use the PATH_INFO environment variable for
request URI (IRequest.uri).  Thus in the above example, IRequest.uri
is '/a/b/c'.  wsgi.py in addition sets the appRootURL to
'http://example.com/cgi-bin/nevowcgi.py/' which is passed from

Lot of code in nevow doesn't use the appRootURL.  For example if
PageC.addSlash is True, the above url will be redirected to
http://example.com/a/b/c/ and not
http://example.com/cgi-bin/nevowcgi.py/a/b/c/ as expected (not the
leading slash)

Because of this reason, I couldn't get wsgi.py work fully.  To fix
some problems (excluding the redirect problem) WSGIRequest.prePathURL
will return the full URL prefixed with appRootURL (which is not the
case with twisted.web.server.Request.prePathURL

Sridhar Ratna - http://srid.bsdnerds.org

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