Apache breaks connections after requests

[Yuri <yuri@xxxxxxxxx>]

I have a question about the situation that happens with Apache with 
Wikimedia app.
In short, Apache begins to break connections when there are many 
concurrent requests.
(Here is the bug report that I created for wikipedia 
https://phabricator.wikimedia.org/T85191).
Connections are broken after http request is complete, but 'Connection: 
keep-alive' has been set by the server in the last response.

I view this a violation of RFC2616 because server breaks connection 
without letting the client know.

My questions are:
What could be misconfigured in Apache? Or maybe this is considered 
normal that it breaks connections?
Is there an option that Apache slows down clients without disconnecting 
in case of congestion?

Yuri

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