[metrics-bugs] #31599 [Metrics/CollecTor]: Create utility class for downloading from HTTP servers

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#31599: Create utility class for downloading from HTTP servers
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     Reporter:  karsten            |      Owner:  metrics-team
         Type:  enhancement        |     Status:  new
     Priority:  Medium             |  Milestone:
    Component:  Metrics/CollecTor  |    Version:
     Severity:  Normal             |   Keywords:
Actual Points:                     |  Parent ID:
       Points:                     |   Reviewer:
      Sponsor:                     |
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 We have several modules downloading from HTTP servers, which means we have
 quite some similar-but-not-exactly-the-same code. We should create a
 utility class, write some tests for that (which might not be trivial, but
 I don't know yet), and use it from our various modules.

 This is something where a friendly volunteer might help!

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31599>
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