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Each release usually includes various fixes and improvements. The most noteworthy of these, as well as any features and breaking changes, are listed here.

Significant changes

v3.7.0 -> v4.0.0
  • removed all non version /v3 or /v4 endpoints (except /version).
  • /v4/websocket does not accept any messages anymore.
  • v4 uses the sessionId instead of the resumeKey for resuming.
  • v4 now returns the tracks artworkUrl and isrc if the source supports it.
  • removal of deprecated json fields like track.
  • addition of artworkUrl and isrc fields to the Track Info object.
  • addition of the full Track object in TrackStartEvent, TrackEndEvent, TrackExceptionEvent and TrackStuckEvent.
  • updated capitalization of Track End Reason and Severity
  • reworked Load Result object
  • allow setting user data on tracks in the REST API. For more info see here

All websocket ops are removed as of v4.0.0 and replaced with the following endpoints and json fields:

v3.6.0 -> v3.7.0
  • Moved HTTP endpoints under the new /v3 path with /version as the only exception.
  • Deprecation of the old HTTP paths.
  • WebSocket handshakes should be done with /v3/websocket. Handshakes on / are now deprecated.
  • Deprecation of all client-to-server messages (play, stop, pause, seek, volume, filters, destroy, voiceUpdate & configureResuming).
  • Addition of REST endpoints intended to replace client requests.
  • Addition of new WebSocket dispatch Ready OP to get sessionId and resume status.
  • Addition of new Session/Player REST API.
  • Addition of /v3/info, replaces /plugins.
  • Deprecation of Track.track in existing endpoints. Use Track.encoded instead.
  • Deprecation of TrackXEvent.track in WebSocket dispatches. Use TrackXEvent.encodedTrack instead.
  • Player now has a state field which contains the same structure as returned by the playerUpdate OP.

All websocket ops are deprecated as of v3.7.0 and replaced with the following endpoints and json fields:

v3.3 -> v3.4
  • Added filters
  • The error string on the TrackExceptionEvent has been deprecated and replaced by the Exception object following the same structure as the LOAD_FAILED error on /loadtracks.
  • Added the connected boolean to player updates.
  • Added source name to REST api track objects
  • Clients are now requested to make their name known during handshake
v2.0 -> v3.0
  • The response of /loadtracks has been completely changed (again since the initial v3.0 pre-release).
  • Lavalink v3.0 now reports its version as a handshake response header. Lavalink-Major-Version has a value of 3 for v3.0 only. It's missing for any older version.
v1.3 -> v2.0

With the release of v2.0 many unnecessary ops were removed:

  • connect
  • disconnect
  • validationRes
  • isConnectedRes
  • validationReq
  • isConnectedReq
  • sendWS

With Lavalink 1.x the server had the responsibility of handling Discord VOICE_SERVER_UPDATEs as well as its own internal ratelimiting. This remote handling makes things unnecessarily complicated and adds a lot og points where things could go wrong. One problem we noticed is that since JDA is unaware of ratelimits on the bot's gateway connection, it would keep adding to the ratelimit queue to the gateway. With this update this is now the responsibility of the Lavalink client or the Discord client.

A voice connection is now initiated by forwarding a voiceUpdate (VOICE_SERVER_UPDATE) to the server. When you want to disconnect or move to a different voice channel you must send Discord a new VOICE_STATE_UPDATE. If you want to move your connection to a new Lavalink server you can simply send the VOICE_SERVER_UPDATE to the new node, and the other node will be disconnected by Discord.

Depending on your Discord library, it may be possible to take advantage of the library's OP 4 handling. For instance, the JDA client takes advantage of JDA's websocket write thread to send OP 4s for connects, disconnects and reconnects.