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http: overridable keep-alive behavior of `Agent`

Rodrigo Muino Tomonari requested to merge github/fork/indutny/feature/http-agent-keepalive-override into master
Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • documentation is changed or added
  • commit message follows commit guidelines
Affected core subsystem(s)

http

Introduce two overridable Agent methods:

  • keepSocketAlive(socket)
  • reuseSocket(socket, req)

These methods can be overridden by particular Agent class child to make keep-alive behavior customizable.

Motivation: destroy persisted sockets after some configurable timeout. It is very non-trivial to do it with available primitives. Such program will most likely need to poke with undocumented events and methods of Agent. With introduced API such behavior is easy to implement.

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