[metrics-bugs] #22026 [Metrics/Ideas]: Create new service to retrieve raw documents

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#22026: Create new service to retrieve raw documents
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 Reporter:  irl            |          Owner:  metrics-team
     Type:  enhancement    |         Status:  new
 Priority:  Medium         |      Milestone:
Component:  Metrics/Ideas  |        Version:
 Severity:  Normal         |     Resolution:
 Keywords:                 |  Actual Points:
Parent ID:                 |         Points:
 Reviewer:                 |        Sponsor:
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Comment (by irl):

 I've thought some more about this. In fact, the use case is almost
 satisfied by the directory protocol. To fetch the latest server descriptor
 or extrainfo descriptor, `/tor/{server,extrainfo}/fp/<FP>` provides this.

 There are some problems I can see with this approach that I still think
 needs another layer in between though:

 1. We should probably run a relay dedicated for the purpose of serving
 these descriptors, probably reverse proxy it behind nginx/Apache and give
 it a DNS name and an SSL certificate.
 2. As part of the reverse proxying, we should (maybe? not sure if actually
 required) rewrite the content type to `text/plain`.
 3. As another part of the reverse proxying, we should add an `Access-
 Control-Allow-Origin: *` header.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22026#comment:9>
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