[MacPorts] #63325: py-pip: Warning: Value for scheme.headers does not match

[MacPorts]

#63325: py-pip: Warning: Value for scheme.headers does not match
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  Reporter:  WolfgangFahl  |      Owner:  stromnov
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:
      Port:  py-pip        |
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Comment (by WolfgangFahl):

 It affects me with the latest macports (updated yesterday). So what do i
 have to do?

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Ticket URL: <https://trac.macports.org/ticket/63325#comment:7>
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