Opensubtitles Rate Limit Exceeded

[Artiume]

Opensubtitles will exceed the rate limit of the API.

https://trac.opensubtitles.org/projects/opensubtitles/wiki/XMLRPC
API Request limit: 40 HTTP requests per 10 seconds per IP address

We should also probably integrate the X-ratelimit header to the sources that respect the header.
Check HTTP Response header 'X-RateLimit-Remaining' for http requests remaining per given period.

Might be worth while for this as well
If you get 407 Download limit reached, do not use persistent connections (HTTP keep-alive) and don't download more than 200 subtitles per 24 hour per IP/User

Paid members still have a rate limit
Higher download limits - 1000 subtitles/24 hours - useful when using programs such as media centers (but no abusing!)

[JustAMan]

This feels like the Opensubtitles plugin issue, so I moved it.

[develroo]

I can confirm that the rate limit does seem to be reset after 24 hours so scheduling it to run every 48 hours means I get at least another 200 subtitles but really it makes my logs a mess with messages like this.

MediaBrowser.Model.Net.HttpException: Too Many Requests
   at Emby.Server.Implementations.HttpClientManager.HttpClientManager.EnsureSuccessStatusCode(HttpResponseMessage response, HttpRequestOptions options)
   at Emby.Server.Implementations.HttpClientManager.HttpClientManager.SendAsyncInternal(HttpRequestOptions options, HttpMethod httpMethod)
   at Emby.Server.Implementations.HttpClientManager.HttpClientManager.SendAsync(HttpRequestOptions options, HttpMethod httpMethod)
   at OpenSubtitlesHandler.Utilities.SendRequestAsync(Byte[] request, String userAgent, CancellationToken cancellationToken)
   at OpenSubtitlesHandler.OpenSubtitles.SearchSubtitlesAsync(SubtitleSearchParameters[] parameters, CancellationToken cancellationToken)
   at Jellyfin.Plugin.OpenSubtitles.OpenSubtitleDownloader.Search(SubtitleSearchRequest request, CancellationToken cancellationToken)
   at MediaBrowser.Providers.Subtitles.SubtitleManager.SearchSubtitles(SubtitleSearchRequest request, CancellationToken cancellationToken)
[04:00:35] [ERR] Error downloading subtitles from Open Subtitles

[dkanada]

We should probably stop a scan with no account when this result is returned.