[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3420: Twisted web Resources should "return ErrorPage" instead of "raise WebError"

[Tahoe-LAFS]

#3420: Twisted web Resources should "return ErrorPage" instead of  "raise
WebError"
-----------------------------------+------------------------------
     Reporter:  sajith             |      Owner:  sajith
         Type:  defect             |     Status:  assigned
     Priority:  normal             |  Milestone:  Support Python 3
    Component:  code-frontend-web  |    Version:  n/a
   Resolution:                     |   Keywords:
Launchpad Bug:                     |
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Description changed by exarkun:

Old description:

> In case of errors, twisted.web `Resource` instances should be responding
> with an error page, instead of throwing an exception.  Any `raise
> WebError` instances we have in Tahoe WUI should be replaced with `return
> ErrorPage`.
>
> More background is in [[https://github.com/tahoe-lafs/tahoe-
> lafs/pull/781|this discussion]] at !GitHub about a PR that solves #3382.

New description:

 In case of errors, twisted.web `Resource` instances should be responding
 with an error page, instead of throwing an exception.  Any `raise
 WebError` instances we have in Tahoe WUI should be replaced with `return
 ErrorPage`.

 More background is in [[https://github.com/tahoe-lafs/tahoe-
 lafs/pull/781|this discussion]] at !GitHub about a PR that solves #3382.

 Sub-tickets:

 - https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3422
 - https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3423
 - https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3424
 - https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3425
 - https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3426
 - https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3427

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3420#comment:3>
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