[tor-bugs] #15843 [Onionoo]: Provide a list of fallback mirrors in case of a server error

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#15843: Provide a list of fallback mirrors in case of a server error
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 Reporter:  karsten      |          Owner:
     Type:  enhancement  |         Status:  new
 Priority:  normal       |      Milestone:
Component:  Onionoo      |        Version:
 Keywords:               |  Actual Points:
Parent ID:               |         Points:
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 There are currently two Onionoo instances running, and more are being set
 up.  If one of them fails, users have to manually switch to another
 instance by using an Atlas/Globe/Compass mirror that uses an Onionoo
 mirror that is still working.

 The easy part is to configure a set of URLs and have Onionoo give them out
 in case of a server error.  Well, not easy, but solvable.

 The harder part is to make sure that Onionoo clients will be able to use
 this information, either by displaying alternatives, or by automatically
 switching to one of them.

 How would Onionoo clients want to learn about fallback mirrors?  In a
 custom JSON document, using an HTTP 3xx status code, or using some other
 mechanism?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15843>
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