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.
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Германия — Бундеслига|24-й тур，更多细节参见同城约会
Source: Computational Materials Science, Volume 267