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1. Renames
Some of the items in this module were renamed to be less generic:
- Handler => Incoming
- ClientHandler => Requests
- ResponseHandler => InFlightRequest
- Channel::{respond_with => requests}
In the case of Handler: handler of *what*? Now it's a bit clearer that
this is a stream of Channels (aka *incoming* connections).
Similarly, ClientHandler was a stream of requests over a single
connection. Hopefully Requests better reflects that.
ResponseHandler was renamed InFlightRequest because it no longer
contains the serving function. Instead, it is just the request, plus
the response channel and an abort hook. As a result of this,
Channel::respond_with underwent a big change: it used to take the
serving function and return a ClientHandler; now it has been renamed
Channel::requests and does not take any args.
2. Execute methods
All methods thats actually result in responses being generated
have been consolidated into methods named `execute`:
- InFlightRequest::execute returns a future that completes when a
response has been generated and sent to the server Channel.
- Requests::execute automatically spawns response handlers for all
requests over a single channel.
- Channel::execute is a convenience for `channel.requests().execute()`.
- Incoming::execute automatically spawns response handlers for all
requests over all channels.
3. Removal of Server.
server::Server was removed, as it provided no value over the Incoming/Channel
abstractions. Additionally, server::new was removed, since it just
returned a Server.