On the server side, instances of [ServerHttp2Stream][] are created either
when:
- A new HTTP/2
HEADERSframe with a previously unused stream ID is received; - The
http2stream.pushStream()method is called.
On the client side, instances of [ClientHttp2Stream][] are created when the
http2session.request() method is called.
On the client, the Http2Stream instance returned by http2session.request()
may not be immediately ready for use if the parent Http2Session has not yet
been fully established. In such cases, operations called on the Http2Stream
will be buffered until the 'ready' event is emitted. User code should rarely,
if ever, need to handle the 'ready' event directly. The ready status of an
Http2Stream can be determined by checking the value of http2stream.id. If
the value is undefined, the stream is not yet ready for use.
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