fix: use more reliable close event #1880
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The close event from the request object is not guaranteed to fire on the same order across major versions of Node.js, the more accurate way to look if the connection was closed is to listen to the event on the socket. Fixes tests on v16. Ref: nodejs/node#38924
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josephharrington
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Jan 31, 2022
In #1880, we switched from using the close event on `req` to close on `req.socket`. This addressed the intended issue but can trigger frequent warnings when keep-alive is used due to a listener being added for each request on the same socket. By using the close event on `res` instead, we address both the issue of event ordering in Node.js >= 16 that the original change was targeting and the event emitter warning leak.
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The close event from the request object is not guaranteed to fire on the
same order across major versions of Node.js, the more accurate way to
look if the connection was closed is to listen to the event on the
socket. Fixes tests on v16.
Ref: nodejs/node#38924