private static function init(RequestOptions $options)
    {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $options->Url);
        curl_setopt_array($ch, self::$defaultOptions);  //default options
        //include headers in response
        curl_setopt($ch, CURLOPT_HEADER, $options->IncludeHeaders);
        //include body in response
        curl_setopt($ch, CURLOPT_NOBODY, !$options->IncludeBody);
        //Set method
        if($options->Method == HttpMethod::Post)
            curl_setopt($ch, CURLOPT_POST, 1);
        else if($options->Method == HttpMethod::Patch)
           curl_setopt($ch, CURLOPT_CUSTOMREQUEST, $options->Method);
        else if($options->Method == HttpMethod::Delete)
            curl_setopt($ch, CURLOPT_CUSTOMREQUEST, $options->Method);
        //set Post Body
        if(isset($options->Data))
            curl_setopt($ch, CURLOPT_POSTFIELDS, $options->Data);
        if(is_resource($options->StreamHandle)) {
            $opt = $options->Method === HttpMethod::Get ? CURLOPT_FILE : CURLOPT_INFILE;
            curl_setopt($ch, $opt, $options->StreamHandle);
        }
        $options->addCustomHeader("content-length",strlen($options->Data));
        //custom HTTP headers
        if($options->Headers)
            curl_setopt($ch, CURLOPT_HTTPHEADER, $options->getRawHeaders());
        //debugging mode
        curl_setopt($ch,CURLOPT_VERBOSE, $options->Verbose);
        //SSL Version
        if(!is_null($options->SSLVersion)) {
            curl_setopt($ch,CURLOPT_SSLVERSION, $options->SSLVersion);
        }
        //authentication
        if(!is_null($options->AuthType))
            curl_setopt($ch,CURLOPT_HTTPAUTH, $options->AuthType);
        if(!is_null($options->UserCredentials))
            curl_setopt($ch,CURLOPT_USERPWD, $options->UserCredentials->toString());

        return $ch;
    }