YAMAMOTO Takashi 159ca00752 webclient: Allow users to specify extra headers for proxy
My primary motivation at this point is to use it for basic proxy auth.
(specify "Proxy-Authorization" header)
But there can be other use cases for proxy-specific extra headers.

If/when we want to support other non-trivial auth methods, probably
a callback-based mechanism will be necessary. But at this point,
this serves my purpose well.
2022-06-15 20:40:53 +08:00
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