Design Considerations For A Swift HTTP Client

In addition to the ongoing discussions of the lowest level networking types like IP address, we'd like to start discussions around the very top of the stack, the HTTPClient. This is a large design space with many existing solutions in Swift and across all programming languages. For the purposes of this thread we'd like to cover some specific topics. Feel free to bring up additional questions and we can continue discussion and spin off other threads, which will be linked back here. Current topics...