We are consistently seeing error "ERR_HTTP2_PROTOCOL_ERROR" in browser console 
when we try to open any web page deployed on Tomcat 9.0.58 server in test 
environment. This issue is observed only when HTTP/2 is enabled. Otherwise, we 
do not see any issue with HTTP/1.1.
Basically, we are assessing the possibility to switch to HTTP/2, however this 
issue is somehow blocking us.

Enabled HTTP/2 with --> <UpgradeProtocol 

Is there any particular issue with HTTP/2 ? Any additional configuration 
required at tomcat side to overcome it?


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