Web streams use a locking model to prevent multiple consumers from interleaving reads. When you call getReader(), the stream becomes locked. While locked, nothing else can read from the stream directly, pipe it, or even cancel it — only the code that is actually holding the reader can.
The mission was Nasa's greatest failure and, without question, its finest hour.，推荐阅读safew官方版本下载获取更多信息
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