存在2个bug

[orestonce]

1. getHost的时候应该使用 path.Dir，而不是filepath.Dir, 具体看 go/src/path/filepath/path.go:9 的注释
   //To process paths such as URLs
   // that always use forward slashes regardless of the operating
   // system, see the path package.

• 在windows下filepath包处理出来的是反斜杠(\) 状态，拼接回去并且url上存在端口时就让url无法被解析, 例子: https://go.dev/play/p/g1q3Db72Yed

2. getTsList 函数内, Url: fmt.Sprintf("%s/%s", host, line), 获取到的url不对，应该将下载m3u8的url和 m3u8内容里面的行都解析成url, 然后做一个 urlObj.ResolveReference(lineObj).String()

func resolveRefUrl(baseUrl string, extUrl string) (after string, errMsg string) {
	urlObj, err := url.Parse(baseUrl)
	if err != nil {
		return "", err.Error()
	}
	lineObj, err := url.Parse(extUrl)
	if err != nil {
		return "", err.Error()
	}
	return urlObj.ResolveReference(lineObj).String(), ""
}