[MacPorts] #56975: livecheck broken in GitHub PortGroup

[MacPorts]

#56975: livecheck broken in GitHub PortGroup
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  Reporter:  l2dy        |      Owner:  (none)
      Type:  defect      |     Status:  closed
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:  worksforme  |   Keywords:
      Port:              |
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Comment (by ryandesign):

 Yes, we should change MacPorts to send an `Accept` header that's similar
 to what a browser sends.

 We should also see if we can make the github portgroup request a smaller
 document for livecheck, such as the atom feed, to save bandwidth.

 We should also have livecheck request a compressed response to save
 bandwidth; see #55011.

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Ticket URL: <https://trac.macports.org/ticket/56975#comment:15>
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