Changelog

Reworked the internal architecture to improve modularity, maintainability, and long-term extensibility
Clearer separation of responsibilities between core components
Reduced coupling between modules, making future enhancements safer and easier

Performance Enhancements

Improved execution efficiency in key processing paths
Reduced unnecessary allocations and redundant operations
Optimized data access and internal workflows for better runtime performance

[3.1.2] - 2024-08-18

Added

Allowing Untrusted SSL Certificates
Auto upgrade to websocket
Added a cancellation token for method ConnectAsync(CancellationToken), in most of the case you won't need this overload unless you need to stop the connection for some reason.

[3.1.1] - 2023-09-05

Added

Fixed concurrency issue for packet id
Upload SocketIO.Core and SocketIO.Serializer.Core to NuGet

[3.1.0] - 2023-08-25

Added

SocketIO.Serializer.MessagePack serializer
SocketIO.Serializer.NewtonsoftJson serializer
SocketIO.Serializer.SystemTextJson serializer

Removed

SocketIOClient.Newtonsoft.Json serializer, use SocketIO.Serializer.NewtonsoftJson instead.

[3.0.8] - 2023-03-04

Added

Expose namespace as a readonly property #304

Changed

Update NuGet dependencies
Cancel reconnecting when calling Disconnect or Dispose #307
Improve performance

[3.0.8] - 2023-03-04

Added

Expose namespace as a readonly property #304

Changed

Update NuGet dependencies
Cancel reconnecting when calling Disconnect or Dispose #307
Improve performance

[3.0.7] - 2022-11-29

Added

Support custom User-Agent header

Changed

Fixed OnAny does not fire when received binary messages
Update NuGet dependencies
Fixed http pooling concurrency issues
Improve performance

[3.0.6] - 2022-03-17

Added

auth handshake for socket.io server v3
support auto upgrade transport protocol

Changed

Fixed OnDisconnect not fired for 'io server disconnect' event #269

[3.0.5] - 2022-01-12

Changed

Fixed an error when pinInterval and pingTimeout are strings #243
Clean up event handler when the connection is disconnected
Fixed IOClientDisconnect #254

[3.0.4] - 2021-12-6

Changed

Fix the problem of out of order when sending json, it will cause the server to received an Error: Invalid Payload.

[3.0.3] - 2021-9-24

Added

Regression support for socket.io server v2, for socket.io server v2 users, please explicitly set EIO = 3.
Added Transport option, default is Websocket
EIO option

Removed

AutoUpgrade option

[3.0.2] - 2021-9-22

Added

ExtraHeaders

Changed

fix WebSocketException on manual reconnection after manual disconnection
fix that the query cannot be changed after the connection is successful

[3.0.1] - 2021-9-18

Added

Support for Xamarin is more friendly

Changed

Fix 'Attemps' count wrong when reconnecting

[3.0.0] - 2021-9-13

SocketIOClient v3.0.0 supports http polling and websocket, socket.io server v2.x is no longer supported.

Added

http polling
SocketIOClient.ClientWebSocketProvider
If you want to use http polling and do not want the library to upgrade the transport, please set Options.AutoUpgrade = false.

Removed

EIO option
SocketIOClient.Socket
socket.io server v2.x is no longer supported. If a large number of users use this version, please feedback.

[2.3.1] - 2021-8-3

Changed

fix: first OnReconnectAttempt will not triggered when reconnecting
fix: incorrect disconnect reason

[2.3.0] - 2021-7-21

Added

OnReconnected event
OnReconnectAttempt event
OnReconnectError event
OnReconnectFailed event

Changed

SocketIOCLient.Windows7 becomes a plug-in, the following code shows how to support Windows7 / Windows 2008 R2

var client = new SocketIO(...);
client.Socket = new ClientWebSocketManaged();

Removed

OnReconnecting event
Options.AllowedRetryFirstConnection
OnReceivedEvent event

[2.2.4] - 2021-6-24

SocketIOClient SocketIOClient.Windows7

Changed

Set the default EIO to 4

Added

Strong name for SocketIOClient.Windows7

[2.2.3] - 2021-6-15

SocketIOClient SocketIOClient.Windows7

Changed

Fix: wrong num was used when sending multiple byte arrays at once

Added

OnAny
OffAny
PrependAny
ListenersAny

[2.2.2] - 2021-6-7

SocketIOClient SocketIOClient.Windows7

Changed

Increase the buffer size to improve the performance when receiving big data

[2.2.1] - 2021-6-5

SocketIOClient SocketIOClient.Windows7

Changed

Fix the problem of disconnection when sending large amounts of data continuously

[2.2.1] - 2021-5-8

SocketIOClient.Newtonsoft.Json

Changed

Fix binary message index is out of range(SocketIOClient.Newtonsoft.Json)

[2.2.0] - 2021-4-29

Added

Use System.Text.Json serialization/deserialization
Decouple JSON plugin
SocketIOClient.Newtonsoft.Json
Support CancellationToken to cancel Emit

Changed

.NET Framework 4.5 is no longer supported

[2.1.7] - 2021-3-24

Changed

Fix Unicode characters garbled

[2.1.6] - 2021-3-11

Changed

Strong-named assemblies
Fix reconnection failure

[2.1.5] - 2021-2-5

Removed

Strong-named assemblies, PFX signing not supported on .NET Core.

[2.1.4] - 2021-2-5

Changed

Strong-named assemblies
Optimize for .NET Framework(WebSocketSharpClient)

[2.1.3] - 2021-1-13

Changed

Fix socket.io v3 binary message bug

[2.1.2] - 2020-12-23

Added

Support custom connection interval

Changed

Fix multiple pings working at the same time in some cases

[2.1.1] - 2020-11-13

Added

Support socket.io v3

[2.1.0] - 2020-11-11

No longer maintain SocketIOClient.NetFx, it is replaced by SocketIOClient. For users, you don’t have to worry about choosing SocketIOClient or SocketIOClient.NetFx