On 01/07/2021 08:57, Mark Thomas wrote:
On 01/07/2021 08:41, Erik Nilsson wrote:
<Connector port="443" protocol="org.apache.coyote.http11.Http11NioProtocol"
            connectionTimeout="20000" compression="on" useAsyncIO="false"
compressibleMimeType="text/html,text/xml,text/css,text/javascript,text/plain,application/xml,application/javascript,application/json,image/svg+xml"             SSLEnabled="true" scheme="https" secure="true" URIEncoding="UTF-8" >             <UpgradeProtocol className="org.apache.coyote.http2.Http2Protocol" />


It looks like there are multiple issues going on here then - in additional to the sendfile issue I already fixed. I'll fix the issue I'm currently seeing and then try again to recreate the issue you are seeing. I'll keep the thread updated with how I get on.

I've found and fixed a couple of issues with the management of the connection flow control window. The fixes are consistent with the workarounds you described (reduce the size of the stream flow control window, reduce concurrent streams).

The fixes are included in the latest snapshot from:


(tomcat-9.0-20210701.191821-3270 or later)

If you are able to test the snapshot in your dev environment, it would be very helpful to know if the issue has been resolved.


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