added use of URL-encoder to unencode the URL values (to fill the parameters)

review design of GW_RESPONSE to hide the output, and remove the header attribute
added script_url in REQUEST to help the user build url relative to script_name

+ cosmetic

library/server/ewsgi/examples/hello_world/src/hello_world.e

@@ -20,8 +20,8 @@ feature {NONE} -- Initialization
 
 	execute (req: GW_REQUEST; res: GW_RESPONSE)
 		do
-			res.output.put_header (200, <<["Content-Type", "text/plain"]>>)
-			res.output.put_string ("Hello World!%N")
+			res.write_header (200, <<["Content-Type", "text/plain"]>>)
+			res.write_string ("Hello World!%N")
 		end
 
 	port_number: INTEGER = 8123