[web2py] redirect fails in module

[Cliff]

What am I doing wrong?

This code works fine in a controller.  When moved to a module it fails
with a 303 error.
Here is the code:

### Controller:
def trash():
    import trash_it
    return trash_it.trashit(request, session,response, db)

## module trash_it.py
from html import FORM, H2, P, BR, INPUT, URL
from http import HTTP, redirect

def trashit(request, session, response, db):
    import crumbs
    crumb_trail = crumbs.do_crumbs(session, request, db)
    form = FORM(
        H2('Are you sure?'),
        P('Do you really want to move the item to the trash?'),
        BR(),
        INPUT(_type='submit', _name='yes', _value='Yes, trash it',
              _style='margin-right:1em'
             ),
        INPUT(_type='submit', _name='no', _value='No'),
    )
    response.view = 'are_you_sure.html'

    if form.accepts(request, session):
        if 'yes' in request.post_vars:
            db[request.controller][request.args(0)] =
dict(is_active=False)
            session.flash = 'Item moved to trash.'
            redirect(URL(request.application, request.controller,
'index'))
        elif 'no' in request.post_vars:
            session.flash = 'Trash cancelled.'
            redirect(URL(request.application, request.controller,
'index'))
    else:
        response.flash = 'Just checking.'

    return dict( form=form, crumb_trail=crumb_trail)

# The traceback

Traceback (most recent call last):
  File "/media/Myfiles/3-o/gluon/main.py", line 493, in wsgibase
    serve_controller(request, response, session)
  File "/media/Myfiles/3-o/gluon/main.py", line 202, in
serve_controller
    page = run_controller_in(request.controller, request.function,
environment)
  File "/media/Myfiles/3-o/gluon/compileapp.py", line 537, in
run_controller_in
    restricted(code, environment, filename)
  File "/media/Myfiles/3-o/gluon/restricted.py", line 204, in
restricted
    exec ccode in environment
  File "/media/Myfiles/3-o/applications/operations/controllers/
buckslips.py", line 344, in <module>
  File "/media/Myfiles/3-o/gluon/globals.py", line 172, in <lambda>
    self._caller = lambda f: f()
  File "/media/Myfiles/3-o/applications/operations/controllers/
buckslips.py", line 341, in trash
    return trash_it.trashit(request, session,response, db)
  File "applications/operations/modules/trash_it.py", line 22, in
trashit
    redirect(URL(request.application, request.controller, 'index'),
  File "/media/Myfiles/3-o/gluon/http.py", line 128, in redirect
    Location=location)
HTTP: 303 SEE OTHER