[Zope] uncatchable 'Bad Request' exceptions ?

[Florent Guillaume]

Zope 2.3.3, python 1.5.2.

>From a python script I can't seem to catch a 'Bad Request' exception.

This doesn't work:
# script1
raise 'Bad Request', 'foo'

# script2
try: context.script1()
except 'Bad Request', x: return x
return 'nothing'

I get a Zope error:
 Error Type: Bad Request
 Error Value: foo


But the following one works...
# script1
raise 'bar', 'foo'

# script2
try: context.script1()
except 'bar', x: return x
return 'nothing'


And this one too...
# script1
raise 'Bad Request', 'foo'

# script2
try: context.script1()
except: return 'something'
return 'nothing'


Anyone has an idea ? The exception is raised by another product which I
don't want to touch (CMF RegistrationTool), and I think I should be able
to catch them !


Florent Guillaume
Nuxeo