/// <inheritdoc />
public override void Write(IChannelHandlerContext context, object message, IPromise promise)
{
if (!(message is IHttpRequest request))
{
_ = context.WriteAsync(message, promise);
return;
}
if (this.upgradeRequested)
{
Util.SafeSetFailure(promise, ThrowHelper.GetInvalidOperationException_Attempting(), Logger);
return;
}
this.upgradeRequested = true;
this.SetUpgradeRequestHeaders(context, request);
// Continue writing the request.
_ = context.WriteAsync(message, promise);
// Notify that the upgrade request was issued.
_ = context.FireUserEventTriggered(UpgradeEvent.UpgradeIssued);
// Now we wait for the next HTTP response to see if we switch protocols.
}
