Pyramid, out of the box, requires that you return instances of WebOb HTTP
exceptions rather than raise them. If you'd prefer to raise HTTP
exceptions rather than return them, you can add a view callable named
error_view somewhere in your code. This view callable should simply
return the context it is passed.
def error_view(context, request):
return contextThis configure the error_view you've defined as the "exception view" when
an HTTPException is raised.
from webob.exc import HTTPException
config.add_view(error_view, context=HTTPException)Once your application is configured with an HTTPException error view, you can do this in your view code:
raise HTTPFound(location='http://example.com')Rather than:
return HTTPFound(location='http://example.com')This works because the exception is actually a valid response object. Our
error_view view callable just returns it when the exception view is
executed.
Raising WebOb HTTP exception objects directly will only work in Python 2.5+ (due to WebOb implementation constraints).
See also :ref:`exception_views`.