Improve handler interface and documentation

This change simplifies a little more the sub protocols mechanism.
Aliases have been removed. The renaming of loop handlers as long
polling handlers has been reverted.

Plain HTTP handlers now simply do their work in the init/2
callback. There is no specific code for them.

Loop handlers now follow the same return value as Websocket,
they use ok to continue and shutdown to stop.

Terminate reasons for all handler types have been documented.
The terminate callback is now appropriately called in all cases
(or should be).

Behaviors for all handler types have been moved in the module
that implement them. This means that cowboy_handler replaces
the cowboy_http_handler behavior, and similarly cowboy_loop
replaces cowboy_loop_handler, cowboy_websocket replaces
cowboy_websocket_handler. Finally cowboy_rest now has the
start of a behavior in it and will have the full list of
optional callbacks defined once Erlang 18.0 gets released.

The guide has been reorganized and should be easier to follow.

1 files changed, 0 insertions, 5 deletions

diff --git a/doc/src/guide/erlang_beginners.ezdoc b/doc/src/guide/erlang_beginners.ezdoc
index f62543f..74d3470 100644
--- a/doc/src/guide/erlang_beginners.ezdoc
+++ b/doc/src/guide/erlang_beginners.ezdoc
@@ -33,8 +33,3 @@ Instead of going into every single details of the language,
 Joe focuses on the central concepts behind Erlang, and shows
 you how they can be used to write a variety of different
 applications.
-
-At the time of writing, the 2nd edition of the book is in beta,
-and includes a few details about upcoming Erlang features that
-cannot be used today. Choose the edition you want, then get
-reading!