IdHTTPServer完成websocket服务端编写

procedure TfWebSocket.IdHTTPServer1CommandGet(AContext: TIdContext; ARequestInfo: TIdHTTPRequestInfo; AResponseInfo: TIdHTTPResponseInfo);
var
svk,sValue:string;
FHash: TIdHashSHA1;
strmRequest: TMemoryStream;
begin

FHash := TIdHashSHA1.Create;
strmRequest  := TMemoryStream.Create;
strmRequest.Position := 0;
svk:=ARequestInfo.RawHeaders.Values['Sec-WebSocket-Key'];
Memo1.Lines.Add('Get:'+svk);
AResponseInfo.ResponseNo         := 101;
AResponseInfo.ResponseText       := 'Switching Protocols';
AResponseInfo.CloseConnection    := False;
//Connection: Upgrade
AResponseInfo.Connection         := 'Upgrade';
//Upgrade: websocket
AResponseInfo.CustomHeaders.Values['Upgrade'] := 'websocket';

//Sec-WebSocket-Accept: s3pPLMBiTxaQ9kYGzzhZRbK+xOo=
sValue := svk +                     //... "minus any leading and trailing whitespace"
'258EAFA5-E914-47DA-95CA-C5AB0DC85B11';          //special GUID
sValue := TIdEncoderMIME.EncodeBytes(                      //Base64
FHash.HashString(sValue) );           //SHA1
//sValue := string(FHash.CalcString(AnsiString(sValue)));  //SHA1 + Base64
AResponseInfo.CustomHeaders.Values['Sec-WebSocket-Accept'] := sValue;

//send same protocol back?
AResponseInfo.WriteHeader;
end;