headers{HTTP/2 Headers Object} An object describing the headerscallback{Function} Called oncehttp2stream.pushStream()is finished, or either when the attempt to create the pushedHttp2Streamhas failed or has been rejected, or the state ofHttp2ServerRequestis closed prior to calling thehttp2stream.pushStream()methoderr{Error}stream{ServerHttp2Stream} The newly-createdServerHttp2Streamobject
Call [http2stream.pushStream()][] with the given headers, and wrap the
given [Http2Stream][] on a newly created Http2ServerResponse as the callback
parameter if successful. When Http2ServerRequest is closed, the callback is
called with an error ERR_HTTP2_INVALID_STREAM.
