Leonard Richardson has proposed merging lp:~leonardr/launchpad/bug-271029 into 
lp:launchpad with lp:~leonardr/launchpad/bug-106338 as a prerequisite.

Requested reviews:
  Launchpad code reviewers (launchpad-reviewers)

For more details, see:
https://code.launchpad.net/~leonardr/launchpad/bug-271029/+merge/52423

This branch builds on my fix to bug 106338, and fixes bug 271029 in the same 
way. I 'slam' the 401 error code onto the Unauthorized and ForbiddenAttribute 
exceptions, so that whenever they occur in a web service context, the result is 
a 401 response code instead of an OOPS.

This code is not as straightforward as it may appear. For one thing, the 
Unauthorized bit may not be necessary. We have a special lookup in lazr.restful 
that maps Zope's Unauthorized exception to a 401 response code. So I may take 
that out.

Second, it's not absolutely guaranteed that ForbiddenAttribute means 401. As 
seen in 267888, it might mean 400, when the user tries to modify a read-only 
field. Bug 267888 was a very early lazr.restful bug, and it was fixed by adding 
checks in lazr.restful for attempts to modify a read-only field, but in theory 
it could still happen if a read-only field is explicitly published through the 
web service as read-write.
-- 
https://code.launchpad.net/~leonardr/launchpad/bug-271029/+merge/52423
Your team Launchpad code reviewers is requested to review the proposed merge of 
lp:~leonardr/launchpad/bug-271029 into lp:launchpad.

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