request{http2.Http2ServerRequest}response{http2.Http2ServerResponse}
If a ['request'][] listener is registered or [http2.createServer()][] is
supplied a callback function, the 'checkContinue' event is emitted each time
a request with an HTTP Expect: 100-continue is received. If this event is
not listened for, the server will automatically respond with a status
100 Continue as appropriate.
Handling this event involves calling [response.writeContinue()][] if the
client should continue to send the request body, or generating an appropriate
HTTP response (e.g. 400 Bad Request) if the client should not continue to send
the request body.
When this event is emitted and handled, the ['request'][] event will
not be emitted.
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