dart:io

WebSocketTransformer class

The WebSocketTransformer provides the ability to upgrade a HttpRequest to a WebSocket connection. It supports both upgrading a single HttpRequest and upgrading a stream of HttpRequests.

To upgrade a single HttpRequest use the static upgrade method.

HttpServer server;
server.listen((request) {
  if (...) {
    WebSocketTransformer.upgrade(request).then((websocket) {
      ...
    });
  } else {
    // Do normal HTTP request processing.
  }
});

To transform a stream of HttpRequest events as it implements a stream transformer that transforms a stream of HttpRequest into a stream of WebSockets by upgrading each HttpRequest from the HTTP or HTTPS server, to the WebSocket protocol.

server.transform(new WebSocketTransformer()).listen((webSocket) => ...);

This transformer strives to implement WebSockets as specified by RFC6455.

Implements

• StreamTransformer<HttpRequest, WebSocket>

Constructors

WebSocketTransformer({dynamic protocolSelector(List<String> protocols), CompressionOptions compression: CompressionOptions.compressionDefault })

factory

Create a new WebSocketTransformer. [...]

Properties

hashCode → int

read-only, inherited

The hash code for this object. [...]

runtimeType → Type

read-only, inherited

A representation of the runtime type of the object.

Methods

bind(Stream<HttpRequest> stream) → Stream<WebSocket>

inherited

Transforms the provided stream. [...]

cast<RS, RT>() → StreamTransformer<RS, RT>

inherited

Provides a StreamTrasformer<RS, RT> view of this stream transformer. [...]

noSuchMethod(Invocation invocation) → dynamic

inherited

Invoked when a non-existent method or property is accessed. [...]

toString() → String

inherited

Returns a string representation of this object.

Operators

operator ==(dynamic other) → bool

inherited

The equality operator. [...]

Static Methods

isUpgradeRequest(HttpRequest request) → bool

Checks whether the request is a valid WebSocket upgrade request.

upgrade(HttpRequest request, { dynamic protocolSelector(List<String> protocols), CompressionOptions compression: CompressionOptions.compressionDefault }) → Future<WebSocket>

Upgrades a HttpRequest to a WebSocket connection. If the request is not a valid WebSocket upgrade request an HTTP response with status code 500 will be returned. Otherwise the returned future will complete with the WebSocket when the upgrade process is complete. [...]