While attempting to add a movie using tMDB plugin I received an "Error 404". (I was looking at the proper page for the movie at tMDB at the same time...)
I tried to add the movie using the IMDB plugin and received an "Error 403".
(The movie was not listed at IMDB but was listed at tMDB)
Is there a list of error codes and their meanings?
Http error codes can be easily found on the Internet.
As for TMDB plugin, it's not working properly so far - we are going to adapt it to API changes.
And it seems strange that's not listed on IMDb.com.