Revert "add log message for old client api response"

This reverts commit cb2e177.

src/logplex_api.erl

@@ -157,6 +157,8 @@ handlers() ->
     end},
 
     {['GET', "/sessions/([\\w-]+)$"], fun(Req, [Session]) ->
+        proplists:get_value("srv", Req:parse_qs()) == undefined
+            andalso error_resp(400, <<"[Error]: Please update your Heroku client to the most recent version\n">>),
         Body = logplex_session:lookup(list_to_binary("/sessions/" ++ Session)),
         not is_binary(Body) andalso error_resp(404, <<"Not found">>),
 
@@ -165,14 +167,6 @@ handlers() ->
         not is_binary(ChannelId0) andalso error_resp(400, <<"'channel_id' missing">>),
         ChannelId = list_to_integer(binary_to_list(ChannelId0)),
 
-        case proplists:get_value("srv", Req:parse_qs()) of
-            undefined ->
-                io:format("Old client channel=~w~n", [ChannelId]),
-                error_resp(400, <<"[Error]: Please update your Heroku client to the most recent version\n">>);
-            _ ->
-                ok
-        end,
-
         logplex_stats:incr(session_accessed),
 
         Filters = filters(Data),