(Swift 3,4,5...) TCP Socket Connect through HTTP Proxy

Demonstrates how to connect through an HTTP proxy server.

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func chilkatTest() {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    let socket = CkoSocket()!

    // To connect through an HTTP proxy, set the HttpProxyHostname
    // and HttpProxyPort properties to the hostname (or IP address)
    // and port of the HTTP proxy.  Typical port numbers used by
    // HTTP proxy servers are 3128 and 8080.
    socket.httpProxyHostname = "www.my-http-proxy.com"
    socket.httpProxyPort = 3128

    // Important:  Your HTTP proxy server must allow non-HTTP
    // traffic to pass.  Otherwise this does not work.

    // Connect (via the HTTP proxy) to port 5555 of 192.168.1.108.
    // hostname may be a domain name or IP address.
    var hostname: String? = "192.168.1.108"
    var ssl: Bool = false
    var maxWaitMillisec: Int = 20000
    var success: Bool = socket.connect(hostname, port: 5555, ssl: ssl, maxWaitMs: maxWaitMillisec)
    if success != true {
        print("\(socket.lastErrorText!)")
        return
    }

    // Set maximum timeouts for reading an writing (in millisec)
    socket.maxReadIdleMs = 10000
    socket.maxSendIdleMs = 10000

    // The ficticious server (in this example) is going to send a "Hello World!" 
    // message.  Read it:
    var receivedMsg: String? = socket.receiveString()
    if socket.lastMethodSuccess != true {
        print("\(socket.lastErrorText!)")
        return
    }

    // Close the connection with the server
    // Wait a max of 20 seconds (20000 millsec)
    success = socket.close(20000)

    print("\(receivedMsg!)")

}