How can we improve IIS and the Web Server Role in Windows Server?

Bug: IIS 10 + HTTPS + response.flush() = request is duplicated

On windows server we installed IIS 10 and an SSL license

We observe that if we have a page that contains a response.flush() the request is executed twice (Get or POST)

on FF every request is duplicated, on chrome, IE and Edge the first request is duplicated after that the other request are executed normally (once)

This bug can be reproduced with a simple page with only:

<!--- start asp classic--->
<%
response.flush
%>
<!--- end asp classic--->

This is problematic with every browser, FF because all the requests are duplicated, even form submissions, others because bug this can happen on the first page that contains a "response.flush()"

I am aware that disabling HTTP/2 can resolve this symptomes, but we need to keep HTTP/2 enabled.

Is there any solution for this issue ?

Thank you.

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