Improve proxy connection error handling

[gajus]

Currently if the connection to proxy cannot be established/ error response is received, then global-agent just dies with an uncaught exception.

• global-agent/src/classes/HttpProxyAgent.js

  Line 21 in 41a652b

  const socket = net.connect(

• global-agent/src/classes/HttpsProxyAgent.js

  Line 21 in 41a652b

  const socket = net.connect(

This issue requires building test cases for failing proxy and gracefully handling those scenarios.

Example of connection error handling in https://github.com/koichik/node-tunnel/blob/5fb2fb424788597146b7be6729006cad1cf9e9a8/lib/tunnel.js#L150-L169.

[gajus]

🎉 This issue has been resolved in version 1.9.2 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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