adding support for the origin frame

lib/httpx/connection.rb

@@ -274,6 +274,9 @@ module HTTPX
       parser.on(:promise) do |request, stream|
         request.emit(:promise, parser, stream)
       end
+      parser.on(:origin) do |origin|
+        @origins << origin
+      end
       parser.on(:close) do
         transition(:closing)
       end

lib/httpx/connection/http2.rb

@@ -107,6 +107,7 @@ module HTTPX
       @connection.on(:frame, &method(:on_frame))
       @connection.on(:frame_sent, &method(:on_frame_sent))
       @connection.on(:frame_received, &method(:on_frame_received))
+      @connection.on(:origin, &method(:on_origin))
       @connection.on(:promise, &method(:on_promise))
       @connection.on(:altsvc) { |frame| on_altsvc(frame[:origin], frame) }
       @connection.on(:settings_ack, &method(:on_settings))
@@ -265,6 +266,10 @@ module HTTPX
       emit(:promise, @streams.key(stream.parent), stream)
     end
 
+    def on_origin(origin)
+      emit(:origin, origin)
+    end
+
     def respond_to_missing?(meth, *args)
       @connection.respond_to?(meth, *args) || super
     end