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[WebSocket] websocket 下载文件的原理是啥?

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我之前一直以为是数据传输完了,本地组装,然后浏览器从一个本地的地址下载,然而实际上测试结果好像有点不太对,数据传输完了之后,还是需要走一个从服务器的下载(浏览器上的区别是没有进度条),然后此时关闭服务,这个时候下载会立刻失败,更有意思的事,如果经过 nginx 的代理,即使关掉了原服务,此时的下载还在进行,所以我有点费解了,等于我一个文件数据从服务器拉了 2 遍?那我走 websocket 下载的意义是什么呢?

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