Valid characters in http requests: Tomcat 8.38 -> 8.39

[i...@flyingfischer.ch]

Between Tomcat 8.38 und 8.39 there seems to be a change in handling URL 
parameters:

&paramxy=1|2
This will cause Tomcat to return a 400 error since 8.39. It is the 
character "|" that causes the new behaviour. I suspect these changes:

https://github.com/apache/tomcat/commit/516bda676ac8d0284da3e0295a7df70391315360 


First thing to know:

Is this intended?

Second:

Anyway to restore the previous behaviour of 8.38 with a config option.

Thanks for considering!

Best regards
Markus

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