sgcWebSockets is a cross-platform library enabling real-time client-server communication. Built entirely in Delphi, it supports Windows, Linux, macOS, iOS, and Android with optimized performance for low-latency, high-throughput applications.
A rock-solid foundation for every real-time application.
Windows, Linux 64-bit, macOS, iOS, and Android. Full VCL and FireMonkey support from a single codebase.
RFC 6455 compliant WebSocket server with IOCP on Windows and EPOLL on Linux for maximum concurrent connections.
Full encryption on server and client with OpenSSL and SChannel backends. Built-in certificate management.
Full support for binary frames and Unicode text messages. Transfer files, images, and structured data natively.
PerMessage-Deflate extension reduces bandwidth by up to 80% with configurable compression levels.
WebSocket, HTTP/1.1, and HTTP/2.0 connections on the same port. No separate servers needed.
Built-in mechanisms to keep connections healthy and messages delivered.
Automatic ping/pong at configurable intervals. Detects dead connections early and keeps them alive through firewalls.
Automatic reconnection for clients and auto-restart for servers after unexpected disconnections. Zero-downtime recovery.
Three QoS levels: at most once, at least once, and exactly once delivery for every reliability requirement.
Persistent message storage with configurable levels. Replay missed messages after reconnection.
StartTransaction, Commit, and Rollback methods for atomic multi-step operations.
Limit bits per second per connection. Prevent bandwidth abuse and ensure fair resource allocation.
Multiple strategies to secure your WebSocket connections.
Standard HTTP Basic authentication for username/password credential validation.
Full OAuth2 support for client and server. Integrate with identity providers for token-based authentication.
Server-side session management and token-based URL parameter authentication for browser clients.
Create a WebSocket server with just a few lines of Delphi code.
uses
sgcWebSocket_Server, sgcWebSocket_Types;
var
WSServer: TsgcWebSocketHTTPServer;
procedure TForm1.FormCreate(Sender: TObject);
begin
WSServer := TsgcWebSocketHTTPServer.Create(nil);
WSServer.Port := 8080;
WSServer.SSL := True;
WSServer.OnMessage := OnMessage;
WSServer.Active := True;
end;
procedure TForm1.OnMessage(Connection: TsgcWSConnection;
const aText: string);
begin
// Echo the message back to the client
Connection.WriteData(aText);
end;