Node.js-HTTP Range支持/部分文件下载 [英] Nodejs - HTTP Range support / Partial file download

问题描述

我正在创建一个音乐Web应用程序，该应用程序可以流式传输存储在MongoDB(GridFS)中的MP3.

I am creating a music web app that streams MP3s that I have stored in MongoDB(GridFS).

我的问题:如何添加http范围支持，以便无需等待缓冲区就可以开始流式传输音频文件的1/2.

My Question: How can I add http range support so that I can start streaming the audio file 1/2 of the way through without having to wait for the buffer.

我知道GridFS支持读取X字节-X字节，因此基本上我只需要知道如何获取Node.js即可理解它只需要X-X字节.

I know GridFS supports reading for X bytes - X bytes, so basically I just need to know how to get nodejs to understand it only needs bytes X - X.

谢谢！

推荐答案

客户端将发送Range标头，指定绝对的开始和结束字节，后跟文件总长度或'*'.

The client will send a Range header specifying the absolute starting and ending bytes followed by total file length or '*'.

  . The first 500 bytes:
   bytes 0-499/1234

  . The second 500 bytes:
   bytes 500-999/1234

  . All except for the first 500 bytes:
   bytes 500-1233/1234

  . The last 500 bytes:
   bytes 734-1233/1234

然后，服务器应返回一个响应代码206(部分内容)，而Content-Length应该只是传输的数据量.

The server should then return a response code 206 (Partial content) and the Content-Length should be only the amount of data transmitted.

在范围错误的情况下，服务器应使用bytes */*的Content-Range字段返回416(请求的范围无法满足)，或者应忽略范围请求，并返回整个范围的200文件的正文.

In the case the range is wrong, the server should either return 416 (Requested range not satisfiable) with a Content-Range field of bytes */* or should ignore the range request and return a 200 with the entire body of the file.

服务器还必须发送一个Accept-Ranges字段，其值为接受的范围单位，在这种情况下为bytes.但是范围单位可以是您想要的任何自定义范围单位.

The server must also send an Accept-Ranges field with the value of the accepted range unit, in this case bytes. But the range unit can be any custom range unit you want.

来源: rfc2616

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