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The previous keep-alive strategy was to cycle connections in a round-robin style. However, that will always keep more connections around than are needed. This new strategy will allow extra connections to expire when only a few are needed. This is accomplished by prefering to reuse a connection that was just released to the pool over one that has been there for a long time.
hyper
A Modern HTTP library for Rust.
Documentation
Overview
hyper is a fast, modern HTTP implementation written in and for Rust. It is a low-level typesafe abstraction over raw HTTP, providing an elegant layer over "stringly-typed" HTTP.
Hyper offers both an HTTP client and server which can be used to drive complex web applications written entirely in Rust.
Be aware that hyper is still actively evolving towards 1.0, and is likely to experience breaking changes before stabilising. The current area of change is the movement towards async IO and refining the design around that. You can also see the 1.0 issue milestone.
The documentation is located at http://hyperium.github.io/hyper.