下面就是有道字典获取发音的请求头，你只需要将下面hello换成你要查询的单词即可。
GET /dictvoice?audio=hello&type=2 HTTP/1.1
Accept: */*
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)
Referer: /search?q=hello&keyfrom=fanyi.smartResult
Accept-Language: zh-CN
Accept-Encoding: gzip, deflate
Host: dict.youdao.com
Connection: Keep-Alive