[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2893: Refactor redundant `?t=json` handling code

[Tahoe-LAFS]

#2893: Refactor redundant `?t=json` handling code
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     Reporter:  exarkun            |      Owner:
         Type:  enhancement        |     Status:  new
     Priority:  normal             |  Milestone:  undecided
    Component:  code-frontend-web  |    Version:  1.12.1
   Resolution:                     |   Keywords:  review-needed
Launchpad Bug:                     |
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Changes (by exarkun):

 * keywords:   => review-needed


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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2893#comment:1>
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