[metrics-bugs] #21036 [Metrics/Onionoo]: Onionoo doesn't return JSON for error responses

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#21036: Onionoo doesn't return JSON for error responses
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 Reporter:  lukechilds       |          Owner:  metrics-team
     Type:  defect           |         Status:  new
 Priority:  Low              |      Milestone:
Component:  Metrics/Onionoo  |        Version:
 Severity:  Minor            |     Resolution:
 Keywords:                   |  Actual Points:
Parent ID:                   |         Points:
 Reviewer:                   |        Sponsor:
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Comment (by iwakeh):

 The [https://onionoo.torproject.org/protocol.html Onionoo protocol]
 defines 400 as reply to bad requests. The returned data simply shouldn't
 be parsed.
 A general server error would also return html and clients should be able
 to handle that too.

 Currently, Onionoo doesn't have a more elaborate debugging/error messaging
 protocol part defined.  Requiring JSON as reply to malformed requests is
 in the end requiring a 'debugging extension' to the protocol, i.e., error
 code etc.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21036#comment:2>
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