[tor-bugs] #30867 [Circumvention/Snowflake]: Write proxy-go tests to cover existing implementation

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#30867: Write proxy-go tests to cover existing implementation
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 Reporter:  cohosh                   |          Owner:  cohosh
     Type:  defect                   |         Status:  assigned
 Priority:  Medium                   |      Milestone:
Component:  Circumvention/Snowflake  |        Version:
 Severity:  Normal                   |     Resolution:
 Keywords:  tests, snowflake         |  Actual Points:
Parent ID:  #29259                   |         Points:
 Reviewer:                           |        Sponsor:  Sponsor28
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Comment (by dcf):

 Looks good so far. The `http.RoundTripper` makes sense. `RoundTrip` is
 slightly different than `Do` in that it doesn't follow redirects, but I
 think we want `RoundTrip` behavior anyway.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30867#comment:2>
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