Hey Dave,

I can't seem to replicate this. Here's my example cURL query. The first call responds with a status_code: 12 and every subsequent call responds with a status_code: 8.

curl -H "Accept: application/json" -H "Content-Type: application/json" -d "{'media_id': 550}" \
"http://api.themoviedb.org/3/list/51cd920219c2951e0302b715/add_item?api_key=###&session_id=###"

Strange … I can reproduce it (tested it now again.)

Here is what I’ve done:

 1) Added a movie (550  Fight Club) to one of my lists (Id  51c991a719c29575b200e5e0).

 2) Sent request to TMDb API

           http://api.themoviedb.org/3/list/51c991a719c29575b200e5e0/add_item?api_key=########&session_id=###########

 3) Received the following response:
           The remote server returned an error: (403) Forbidden.


 4) Now I’ve removed (manually, using the website) the movie (550) from my list.

 5) Sent the same request again:
            http://api.themoviedb.org/3/list/51c991a719c29575b200e5e0/add_item?api_key=########&session_id=###########

 6) Received the following response:
           {"status_code":12,"status_message":"The item/record was updated successfully"}

  7)    Sent the same request again:
            http://api.themoviedb.org/3/list/51c991a719c29575b200e5e0/add_item?api_key=########&session_id=###########

  8)    Received the following response:
            The remote server returned an error: (403) Forbidden.

…and so on.

Aha! Your other post got me thinking about this.

Yes, the response code is 403 but if you take a look at the response, we're responding with the proper response.

Looking through the w3 docs, I'd say this is likely the correct response code.