Pub No Longer Works Through A Proxy On M3

[DartBot]

This issue was originally filed by [email protected]

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What steps will reproduce the problem?
1.Download and run M3 Dart editor
2.Run Pub update

Expect for dependencies from pub.dartlang.org to be updated. Instead, a socket error occurs because pub does not work through a proxy.

What version of the product are you using? On what operating system?
M3 on Windows 7

Please provide any additional information below.
On the M2 release, we implemented the workaround described here to get pub to work through a proxy: https://code.google.com/p/dart/issues/detail?id=5454#c13

This workaround no longer works, apparently as a result of this fix:

https://code.google.com/p/dart/issues/detail?id=7395&can=1&q=curl&colspec=ID%20Type%20Status%20Priority%20Area%20Milestone%20Owner%20Summary

[anders-sandholm]

Added Area-Pub, Triaged labels.

[munificent]

Set owner to @nex3.
Added this to the M4 milestone.

[munificent]

Merging this with 5454 since they are the same high-level issue.

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Added Duplicate label.
Marked as being merged into #5454.

[DartBot]

This issue has been moved to dart-lang/pub#461.