You need to know sizes, persistence, priority, and frequency distribution, plus have the ability to correlate message affiliations within the data stream, such as matching requests to replies.
Pulling high-priority sources out of the full stream and putting them in a special place enables you to catch more of the high-value information those sources publish.
把高优先级的内容源从所有信息流中分离出来,可以让你从这些内容源里获得更多高价值信息。
3
PRIORITY frames can be sent on closed streams to prioritize streams that are dependent on the closed stream.