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(Swift) WebSocket ConnectDemonstrates how to establish a WebSocket connection. Once the connection is established, messages may be sent back-and-forth. Messages are sent in frames, where the last frame in the message is indicated by a "final" bit. A frame constitutes the entire message if the first frame sent has the "final" bit sent. (In most cases, you'll probably be sending single-frame messages.)
func chilkatTest() { // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // -------------------------------------------------- // A WebSocket connection begins life as an HTTP GET request containing a few special header fields, // such as "Upgrade: websocket". // Your application will use the Chilkat Rest class to send the initial HTTP GET. This allows you // to use the full capability of the Chilkat Rest class to customize the GET for any particular situation. // For example: // // - If custom HTTP request header fields must be added. // - If authentication is required, such as OAuth2, OAuth1, Basic HTTP Auth, etc. // - If HTTPS, SSH Tunneling, Proxies (HTTP or SOCKS), or other advanced connection or TLS features are required. // let rest = CkoRest() var success: Bool = rest.Connect("someserver.com", port: 80, tls: false, autoReconnect: false) if success != true { print("\(rest.LastErrorText)") return } let ws = CkoWebSocket() // Tell the WebSocket to use this connection. success = ws.UseConnection(rest) if success != true { print("\(ws.LastErrorText)") return } // Add the standard WebSocket open handshake headers that will be needed. // (This adds the required HTTP request headers to the rest object.) ws.AddClientHeaders() // Add any additional headers that might be desired. // Two common WebSocketSpecific headers are "Sec-WebSocket-Protocol" and "Origin". rest.AddHeader("Sec-WebSocket-Protocol", value: "x-something") rest.AddHeader("Origin", value: "http://someserver.com") // Do the open handshake. var responseBody: String? = rest.FullRequestNoBody("GET", uriPath: "/something") if rest.LastMethodSuccess != true { print("\(rest.LastErrorText)") return } // If successful, the HTTP response status code should be 101, // and the response body will be empty. (If it failed, we'll have a look // at the response body..) var statusCode: Int = rest.ResponseStatusCode.integerValue print("Response status code: \(statusCode)") if statusCode != 101 { print("\(responseBody!)") print("-- Failed because of unexpected response status code.") return } // We have the expected 101 response, so let's now validate the // contents of the response, such as the value sent by the server in the // Sec-WebSocket-Accept header. success = ws.ValidateServerHandshake() if success != true { print("\(ws.LastErrorText)") return } print("WebSocket connection successful.") // The application may now begin sending and receiving frames on the WebSocket connection. // (At this point, we're done with the rest object...) } |
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