/// <summary>
/// 客户端发起握手
/// </summary>
/// <param name="url"></param>
/// <param name="serverIP"></param>
/// <param name="serverPort"></param>
/// <param name="subProtocol"></param>
/// <param name="origin"></param>
/// <returns></returns>
public static byte[] RequestHandShark(string url, string serverIP, int serverPort, string subProtocol = SubProtocolType.Default, string origin = "")
{
var sb = new StringBuilder(64);
sb.AppendFormat("{0} {1} HTTP/{2}{3}", "GET", url, "1.1", Enter);
sb.AppendFormat("{0}: {1}{2}", "Host", $"{serverIP}:{serverPort}", Enter);
sb.AppendLine("User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.61 Safari/537.36");
if (!string.IsNullOrEmpty(origin))
{
sb.AppendLine($"Origin: {origin}");
}
sb.AppendFormat("{0}: {1}{2}", "Upgrade", "websocket", Enter);
sb.AppendFormat("{0}: {1}{2}", "Connection", "Upgrade", Enter);
sb.AppendFormat("{0}: {1}{2}", "Sec-WebSocket-Version", "13", Enter);
if (!string.IsNullOrEmpty(subProtocol))
{
sb.AppendFormat("{0}: {1}{2}", "Sec-WebSocket-Protocol", subProtocol, Enter);
}
sb.AppendFormat("{0}: {1}{2}", "Sec-WebSocket-Key", RandomHelper.CreateBase64Key(), Enter);
sb.AppendFormat("{0}: {1}{2}", "Sec-WebSocket-Extensions", "permessage-deflate; client_max_window_bits", Enter);
sb.Append(Enter);
return(Encoding.UTF8.GetBytes(sb.ToString()));
}