fix: Remove the default connection close header (v2 branch) #1765
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This backports #1736 fixing #1735 to the 2.x branch. Reasoning for why this is important is in this comment.
I believe this change is low-risk for applying against 2.x, for a few reasons:
Connection: Close
was ever needed. It appears to have always caused issues if trying to combine with keep-alive.Connection: Close
header: https://nodejs.org/docs/latest-v4.x/api/http.html#http_http_globalagent. - there is a slim chance it might cause slight behaviour differences in terms of connection handling with some legacy web servers, but I believe it is unlikely to break anything and the risk is slim compared with the issue many people are encountering when not fixing the issue.Instead, we rely on the underlying http implementation in Node.js to handle this, as per the documentation at
https://nodejs.org/api/http.html#new-agentoptions
This fixes #1735 and likely replaces #1473
The original change introducing this provided no clear motivation for the override, and the implementation has since been changed to disable this header when an agent is provided, so I think there is sufficient evidence that removing this is the correct behaviour. af21ae6 7f68577
This commit is backported to the v2 branch from #1736 against v3.