AcceptCallback may now return created/see_other tuples for POST

They replace and deprecate the {true,URI} return value.

test/handlers/create_resource_h.erl

@@ -0,0 +1,28 @@
+-module(create_resource_h).
+
+-export([init/2]).
+-export([allowed_methods/2]).
+-export([resource_exists/2]).
+-export([content_types_accepted/2]).
+-export([from_text/2]).
+
+init(Req, Opts) ->
+	{cowboy_rest, Req, Opts}.
+
+allowed_methods(Req, State) ->
+	{[<<"POST">>], Req, State}.
+
+resource_exists(Req, State) ->
+	{true, Req, State}.
+
+content_types_accepted(Req, State) ->
+	{[{{<<"application">>, <<"text">>, []}, from_text}], Req, State}.
+
+from_text(Req=#{qs := Qs}, State) ->
+	NewURI = [cowboy_req:uri(Req), "/foo"],
+	case Qs of
+		<<"created">> ->
+			{{created, NewURI}, Req, State};
+		<<"see_other">> ->
+			{{see_other, NewURI}, Req, State}
+	end.